Sonic Adventure Rerun

Sonic Adventure Rerun is a 2023 3D action-adventure platformer video game published by Sega and developed by Sonic Team, It is a HD remake of the 1998 title Sonic Adventure for the Sega Dreamcast It was released worldwide on PlayStation 4, PlayStation 5, Xbox One, Xbox Series X/S, Microsoft Windows (on Retail and Steam forms) and Nintendo Switch and features completely revamped levels, new modes, and numerous other enhancements and additions.

In Sonic Adventure Rerun, Dr. Robotnik has discovered the mighty monster known as Chaos, whom he plans to use to destroy Station Square and build Robotnikland. To prevent their nemesis from achieving this goal, Sonic and Tails embark on an adventure to secure the seven Chaos Emeralds. Along the way, their old friends Knuckles and Amy, as well as E-102 Gamma, a robot aligned to Robotnik, and Big the Cat, who has lost his friend Froggy; get involved in the skirmish as well and even, learn of Chaos' past through mysterious visions.

Sonic Adventure Rerun received positive reviews from critics with praise given to the story, gameplay, voice acting, music, graphics and faithfulness to the original game, and deemed it the supremely definitive version. Additionally, it sold over 5 million copies by October 2024.

Premise
Three thousand years ago, the Chaos Emeralds and the Master Emerald were both kept at an altar near the territory of a clan of echidnas, specifically the Knuckles Clan. A peaceful echidna named Tikal, daughter of Chief Pachacamac, befriended the Chao that lived at the altar and their protector, who was the water god Chaos. When Pachacamac sought to expand his clan's territory, he wanted to steal the Chaos Emeralds and use their power to defeat his rivals. Although Tikal and the Chao stood against him, he ordered his soldiers to charge anyway, resulting in many Chao being injured. This enraged Chaos, who transformed into Perfect Chaosand destroyed all of the echidnas, except for Tikal, who sealed herself away in the Master Emerald with Chaos, and the magic caused the area surrounding the shrine to become Angel Island, also known as the continent in the sky.

In the present day, the evil scientist Dr. Robotnik happens to stumble across the Knuckles Clan's ancient shrine while building his underground base at the heart of the Mystic Ruins' jungle. There, he manages to decipher some stone tablets, which tell of the legend surrounding Chaos. Eager to use the beast for his own selfish intentions, the doctor finishes his newest stronghold, Final Egg, and starts to work on building the Egg Carrier, an all-purpose aerial fortress. Additionally, he creates the E-100 Series, an army of shooting Badniks. Robotnik's plan is to tame Chaos and use it to destroy Station Square to build his own city, Robotnikland, on its ruins; with the Egg Carrier and the E-100 Series created to help him achieve this goal

Sonic The Hedgehog
Underneath a glittering sky in nighttime, a familiar blue shadow runs through the populated city of Station Square. This figure, which passes cars on the highway, runs on the walls of buildings, and jumps across rooftops, turns out to be no one other than Sonic the Hedgehog, who has just returning home after a long journey to train himself but first stops at the city of Station Square. While he is enjoying himself, however, he hears a blaring siren and then notices the Station Square Police Department staff rush to City Hall. Following the police, he sees them surround Chaos, only to notice upon opening fire at it that their weapons are useless against it. As the staff retreats, the hedgehog steps in and defeats the beast, but it escapes through a water drain. Meanwhile, Dr. Robotnik has been observing his nemesis' clash with Chaos, confident in the latter's supremacy despite its defeat.

The next day, Sonic is relaxing by a pool in Station Square, still thinking about Chaos until he sees Tails crash on the beach in his newest biplane. Hurrying to Emerald Coast, he finds his friend. The two later have a small conversation in Station Square where the fox tells the hedgehog that he was using the plane to test the power of a Chaos Emerald he had found. Sonic is then convinced to come to Tails' Workshop in Mystic Ruins to see a project of his. However, when they get there, Dr. Robotnik shows up to steal the fox's Chaos Emerald. With the heroes refusing to hand the Emerald over, the doctor tries to take it by force with his Egg Hornet, but is defeated. However, he still manages to steal the Emerald from Tails. He then reveals Chaos to the heroes and gives it the Chaos Emerald, turning it into Chaos 1. Robotnik gloats that with every Chaos Emerald he gives to Chaos, the creature becomes more powerful, with his ultimate plan being to make it invincible with all seven Emeralds and then use it to destroy Station Square and build Robotnikland. After that, Robotnik and Chaos 1 retreat. Sonic and Tails thus decide to counter the doctor's plans by securing the other Chaos Emeralds to prevent the creature from transforming.

Sonic and Tails quickly find two Chaos Emeralds: one in Windy Valley and another in Casinopolis. However, after leaving the latter, Robotnik ambushes the duo with Chaos 1 and steals one of the Emeralds before knocking them out with sleeping gas. The next day, continuing onward regardless, the duo goes to Icecap and retrieve another Chaos Emerald. However, they run into Knuckles, who believes the hedgehog has stolen some of the Master Emerald's shards. The two fight, only for Sonic to drop his Chaos Emeralds during the scuffle. The doctor then shows up and takes the Emeralds, having tricked the echidna into fighting Sonic so he could steal the Chaos Emeralds while they were occupied, and gives them to Chaos 2, transforming it into Chaos 4. Regardless, the three heroes still defeat it.

In the aftermath, Robotnik's Egg Carrier appears and picks him up, prompting Sonic and Tails to chase after the vessel in the Tornado. However, the plane gets shot down during the fight with the doctor's ship, and the hedgehog falls down in Station Square. While looking for his friend however, he runs into Amy, who asks him to protect Birdie, a bird she is looking after. Although he refuses to heed the pink hedgehog's request, they are found by E-100 ZERO. While the blue hedgehog is ready to face the robot, Amy heads into Twinkle Park in hopes to getting a date with her friend after seeing that "cute couples get in free". Sonic follows Amy into Twinkle Park, but loses track of her. Knowing she is in danger with ZERO hunting her and sees ZERO is nowhere to be seen, Sonic tries to find her. After finding no signs of her in Speed Highway, he sees her being hauled away by the robot in Station Square.

Following ZERO and Amy to Mystic Ruins, Sonic tries to save the latter, but the Egg Carrier then arrives and picks her and the robot. As he chases the vessel into the Red Mountain, it eventually escapes his reach. Fortunately, Tails shows up in the Tornado 2, and the hedgehog hitches a ride with him as they chase after the Egg Carrier together. Following an aerial battle with the Egg Carrier, the duo crash-lands on the ship. As they try to get to the bridge however, the Egg Carrier changes shape, making the duo's trek harder. Taking a detour through the Sky Deck and Hot Shelter, the two arrive as Amy is confronting Dr. Robotnik, who grabs Birdie and takes a Chaos Emerald out of the pendant it is wearing. He then calls in E-102 Gamma and orders him to get rid of the heroes before leaving. Sonic fights the robot, but Amy stops him from destroying him, insisting that he is her friend. Deciding to trust the pink hedgehog, Sonic leaves Gamma be. However, the Egg Carrier then begins to lose altitude. The blue hedgehog thus has Tails take Amy to Station Square while he goes after Robotnik.

Sonic soon finds Robotnik, only to see that he has given the two more Chaos Emeralds to Chaos, transforming it into Chaos 6. Knuckles and Big the Cat then shows up, Big with the intention of rescuing his friend Froggy from inside the creature. With his help, the hedgehog defeats Chaos 6. After the battle, Sonic tries to catch his nemesis, he follows him off the Egg Carrier. Landing in Sand Hill, Sonic escapes to a part of Mystic Ruins with an ancient shrine in it, Sonic sees a floating orb heading towards it. Believing that it is trying to show him something, he ventures into the shrine, and eventually finds a mural with Perfect Chaos depicted on it. He then finds himself taken to the past, where he sees the Altar of Emerald on fire. Finding Chao lying on the ground and Tikal running towards the Master Emerald, he is taken back to the present. There, Sonic finds Robotnik flying towards the Final Egg. Following him into the heart of the base, the hedgehog confronts him and his Egg Viper. After defeating him, Sonic sees his nemesis retreat and reunites with Tails once again.

Miles “Tails” Prower
With Sonic away in his journey, Miles "Tails" Prower has devoted himself to tinkering in his workshop at the Mystic Ruins. One day after exploring Emerald Coast, he tests a prototype of a Chaos Emerald-powered biplane he has recently created above Station Square. Though everything goes well at first, the Emerald's power soon becomes too powerful for the plane to handle, causing it to suddenly malfunction. After a short, wayward trip through the city and several close calls, the aircraft ends up crash-landing on an island in the emerald sea nearby. Fortunately, Sonic, who witnessed this event, has come in to help his friend.

When Tails and Sonic return to Station Square, Sonic cheers Tails up after the crash, feeling his a failure, and asks his friend what had happened for him to crash like that, to which the fox replies with that he has been attempting to use the Chaos Emerald to power his plane. He then convinces Sonic to go with him to his workshop in the Mystic Ruins to show him something. When they arrive however, they encounter Dr. Robotnik, who exchanges some banter with them and demands them to hand over the Emerald. As the heroes refuse to comply, the evil scientist attacks them with his Egg Hornet. In the aftermath, the doctor is defeated, but manages to snatch the gemstone from Tails with the Eggmobile's claw attachment. Soon after, he reveals Chaos to the duo and gives it the Chaos Emerald, turning it into Chaos 1. Overjoyed with seeing that the stone tablets were correct about Chaos and its relationship to the Emeralds, Robotnik reveals his plan to find the seven Chaos Emeralds and give them to the creature to destroy Station Square and build Robotnikland over its ruins. After the two villains retire, Tails and Sonic agree to look for the Emeralds before the doctor gets them first.

Tails and Sonic collect two Chaos Emeralds: one at the Windy Valley and the other one in Casinopolis. However, after exiting the latter, Robotnik ambushes them with Chaos 1 and sleeping gas, putting them to sleep and allowing the doctor to steal one of their Emeralds. The next day, the duo heads back to the Mystic Ruins to adquire another Emerald in Icecap. Soon after though, they encounter Knuckles. Due to a misunderstanding, Tails and the echidna fight. Robotnik, taking advantage of the situation, snatches away the Emeralds, once again giving them to Chaos, transforming it into Chaos 4. After the heroes defeat the creature, the doctor escapes to his Egg Carrier. The fox and Sonic give chase in the Tornado, but the plane gets shot down in the process. Tails lands alone in the Mystic Ruins sad that he failed once again but soon passes out, After a flashback in Emerald Hill to when he first met the hedgehog, he decides to do without his friend and ventures into the jungle in search for a Chaos Emerald to finish his project. He finds one here, but runs into Big the Cat's friend, Froggy, who proceeds to swallow the gem. After giving chase through the Sand Hill, Tails catches up with the frog who goes inside Lost World and gets the Emerald, but is taken back in time and meets Tikal. When returned to the present, the cat accidentally gives Tails a shock, causing him to lose grip of Froggy as a result.

Using the Chaos Emerald, Tails finishes his newest invention: the Tornado 2. During the flight he is ambushed by a few Eggman Badniks but manages to meets up with Sonic at the peak of the Red Mountain, and the two give chase to the Egg Carrier. Despite the odds, the two manage to land on the aerial fortress. However, Robotnik immediately activates the transformed state that deactivates the monorails, forcing the heroes to go through the Sky Deck and Hot Shelter. In the aftermath, they find the doctor confronting Amy and Birdie. The scientist snatches Birdie using the Eggmobile's claw, and takes a Chaos Emerald out of its pendulum. He then calls in E-102 Gamma to get rid of the heroes. After a short battle against the robot however, Amy convinces Sonic & Tails not to destroy him, as he is her friend. With the Egg Carrier losing attitude, the blue hedgehog has the fox take the pink hedgehog to safety while he goes after Robotnik.

While the Egg Carrier falls down to the ocean, Tails and Amy make it safely to Station Square. As the two separate, the fox spots Robotnik in his Eggmobile crash-landing nearby. Devastated over the Carrier's destruction and Chaos' defeat, the furious doctor decides to launch a missle to destroy the whole city, but turns out to be a dud Angered, Robotnik blasts the doors of a skyscraper and goes to detonate the missile himself. Tails, realizing that the fate of the city is in his hands, gives chase. After a long endurance race through the night, the fox reaches the missile first and deactivates it. Frustrated at his failure, Robotnik deploys the Egg Walkerand threatens Tails to leave before he is turned into mincemeat. All of the scared citizens run for shelter, leaving the fox to fight against his nemesis on his own. In the end, Tails wins and the citizens cheer for him as the doctor is forced to leave. While heading back to the Mystic Ruins, the fox meets up with Sonic.

Knuckles the Echidna
As Knuckles the Echidna rests beside the Master Emerald thinking over the story of his life, how different it would be if the Echidna tribe were still here and what even happens to them, he wakes up to find Chaos next to the shattered Master Emerald. Unaware that this is Robotnik's doing, Knuckles assumes that Chaos is behind the shattering of the Emerald and goes on to attack it. However after a brief fight, the beast blindsides him and escapes, and, suddenly, Angel Island falls into the sea next to the Mystic Ruins. Knuckles arrives in Station Square to find the pieces of the Master Emerald. He finds a few pieces in Emerald Coast, Speed Highway, Twinkle Park and Casinopolis.

Once he has gotten all the shards, he is flashed into the past to a place he's never seen before, but is somehow familiar to him. He overhears Tikal trying to stop her father, Pachacamac, from invading someone's "sacred grounds," but returns to the present before getting the details, shaken by ordeal of seeing the Echidna once again, he shouts to see who sent him back and to keep here there. He then spots Robotnik heading into an elevator in the hotel and thinks he was behind the flashback. He notices the shine in Robotnik's hand and believes it to be a piece of the Master Emerald so he follows Robotnik. Knuckles then gets into a fight with Chaos 2, and after winning the battle, Robotnik tells Knuckles that Sonic is after the emerald pieces. This gets to Knuckles, wondering why the blue blur would want them but doesn’t fully believe him. He then heads into the jungle, where a power-up is found. Knuckles heads to Sand Hill, Red Mountain and Ice Cape where he finds nine more shards. A few minutes later, Knuckles finds Sonic and the two duke it out. But it was all a trick from Robotnik so he could nab the two emeralds they had. He gives them to Chaos, causing him to transform into Chaos 4. Knuckles does eventually defeat him; Sonic and Tails go after Robotnik, and Knuckles goes solo to find the rest of the pieces.

A moment later, Knuckles finds the keys to an abandoned temple called "The Lost World", and finds three more shards, and is sent back to the past. He meets Tikal again, and is sent to his time right in front of the altar. 85% of the Master Emerald is restored. The last three shards are on Robotnik's fortification, the Egg Carrier, but Knuckles has no idea where the fortress is. As he walks across the bridge, he spots E-102 Gamma heading to the jungle. He decides to follow the robot to the jungle and into the fortress, which takes off. Soon, he finds the last shards, but ends up getting sent to the past, this time with the altar under a thick flame. He walks over to Tikal and attempts to find out what's going on, but fails when Tikal rushes to the Emerald, causing him to get sent back to his own time. He spots Robotnik and Chaos and rushes towards them. Robotnik retreats, with Sonic on his heels. This leaves Chaos, who has devoured 6 of the Chaos Emeralds, at Knuckles' merciless spines. After a long battle, Chaos relinquishes the Chaos Emeralds and retreats, with Knuckles saying "Yeah, you're finished!!" The Egg Carrier loses its balance and self-destructs, but Knuckles flies back to Angel Island to prevent himself from getting burned.

Back at the Island, Knuckles restores the Master Emerald to its normal state, allowing the giant gem to hoist Angel Island back into the heavens. Knuckles is once again at peace but still wonders what life would be life if the Echidnas were still here.

Amy Rose
Amy Rose is taking a stroll in Station Square, reminiscing about the good 'ol days adventuring with Sonic, when suddenly the city is shadowed by the Egg Carrier in Speed Highway, As Amu sees why the Egg Carrier is there, a small bird falls down from the sky. The bird was held captive, along with its family, by Dr. Robotnik on his airship. Amy then befriends the bird, who she nicknames "Birdie", and promises she'll help it get home with its family. After a stroll through the town, she runs into Sonic and asks him to guard the bird, though Sonic strongly declines. She follows him to the entrance of Twinkle Park. Unfortunately, E-100 ZERO appears and before Sonic battle with it, Amy notices a sign that apparently says "Cute Couples get in free" and readily enters the park while Sonic follows, trying to stop her. After making her way through Twinkle Park while avoiding ZERO, she makes it back to Station Square and finds Sonic gone. Before she can continue with her search, she is captured by ZERO.

Amy is taken to a cell aboard the Egg Carrier where she is guarded by E-102 Gamma. He demands she hand him the bird, but she refuses. She then demands that he tell her why he wants the bird, but he himself does not know. She pleads with Gamma to help them, but he questions why she cares for something she knows nothing about. She says she pities him because love is not a part of his programming. The bird flies out of the jail cell and looks Gamma in the eyes. Gamma then tells them to escape and deactivates the cell. He tells them it is dangerous and that they'll be at the Mystic Ruins base soon. She comes to a room and plays through a game where she gets the Warrior's Feather. While venturing through Hot Shelter, she has another run-in with ZERO. When she grabs a hold of the balloon, she drifts back into the Egg Carrier. She makes it to the Sky deck and is cornered by Robotnik. Fortunately, Sonic and Tails also make it to the deck. Robotnik grabs the bird and take the Chaos Emerald around its neck. He calls out Gamma who is ordered to destroy them. After fighting Gamma, Sonic tries to deliver the final blow, but Amy defends the robot, telling Sonic he helped her. The Egg Carrier begins to lose altitude and Amy tells Gamma to be free. Gamma asks why she is helping him, to which she responds that she promised they'd be friends. She then leaves with Tails as the Egg Carrier crashes.

She returns to Station Square and bids farewell to Tails and goes to Mystic Ruins to help the bird find its family. After searching through the jungle she finds the bridge leading to Robotnik's base. She goes through Final Egg and once again meets with ZERO, but escapes to Sand Hill, finding the ruins in the temples, she goes back in time to meets Tikal after finding Chaos' shrine. Before they can take in what they saw, Zero attacks and captures Amy. They go back to the now sunken Egg Carrier, The bird finds its family but ZERO knocks out the bird with its telescopic fist. After noticing the perpetrator of the attack, Amy becomes enraged and prepares to fight Zero. After battling and eventually destroying the robotic pursuer, the three birds are reunited and Amy vows to be the best she can be to impress Sonic, and hopefully make him respects her.

E-102 Gamma
Dr. Robotnik introduces himself to the second robot in the E-100 series, E-102 Gamma. His training involves E-102 seeking and searing the Sonic doll in Final Egg. After that, Robotnik introduces Gamma to his older brother, E-101 Beta, and pits them to a small duel. Gamma achieves victory, but E-101 boards the Egg Carrier for repairs and a Level Up Item. The fortress then flies off into the sky.

A moment later, Robotnik announces to Gamma and his younger siblings, E-103 Delta, E-104 Epsilon, E-105 Zeta, E-106 Sigma, E-107 Iota, E-108 Omnicron and E-109 Iona to find and capture Froggy, who's been driven insane by Chaos' tail and has eaten a Chaos Emerald. Gamma heads to the Emerald Coast, grabs Froggy, He goes to Station Square before he is attacked by the owner, Big the Cat and tells him about his backstory and why Froggy is so important to him, Gamma beats him up and is about to return when a blinding flash takes him back in time. He tries to figure his location, but it doesn't work. He heads to the alter and lowers his cannon at the presence of the Chao. Tikal rushes to their aid, but she realizes Gamma's not part of the Knuckles Clan and gives him some helpful information about the Chaos Emeralds, the Chao, and their draconian protector, Chaos. Gamma then reverts to his own time.

After that, Gamma and his siblings argue over whose frog is the one, but stop when Robotnik walks in. Irritated, Robotnik tells them that the frog he wants is crazed, and settles when he spots Froggy in Gamma's hands. He proudly congratulates Gamma for his capture and dismisses the entire E-Series for their idiotic failure. He then tells Gamma to find the bird that Amy is with, then departs. Gamma accidentally gets into the wrong room, where he spots Beta being destroyed, remodeled, and upgraded. He quickly gets to the dungeon where he encounters Amy and the bird, and attempts to persuade her to give him the bird. Amy persistently ignores his orders and tells him that love isn't part of his programing, which Gamma angrily replies that she knows something that she shouldn't know. Then the bird flies to Gamma and looks him straight in his eyes. Agitated, Gamma orders them to flee by opening her cell, then heads to the attendance room, where Robotnik orders him to get the jet booster from the ammunition room. After that, Gamma heads to the main bridge of the Egg Carrier and engages Sonic in battle. Just as he is about to sear Sonic to ash, Amy interferes. She tells him to remember her and says that he should ditch Robotnik, much to Sonic's surprise. Suddenly, the Egg Carrier is about to lose altitude. Sonic races off after Robotnik, while Amy says that she and Gamma be friends. He asks why she is helping him, and she replies that friends always help one another. Gamma, Tails and Amy escape as the Egg Carrier self-destructs and crashes into the Great Sea.

Searching his files, Gamma realizes Amy's words and decides to go rogue, beginning his own quest to find and save his siblings He finds a switch to Windy Valley, explores it completely, spots Delta and battles him. Following this, he heads to Red Mountain, goes in the magma chamber of one volcano, finds Epsilon and defeats him. He then finds the other E-Series in Ice Cap, Sand Hill, Lost World, and Speedway and defeats all of them. After that, he realizes Zeta and Beta are on the Egg Carrier and heads towards it via canoe. Gamma enters the Attendance Room and opens the doors to the Hot Shelter lair, where he goes through its tunnels and spots Zeta, who has transformed into a large cylinder-like monster, Zeta tells him that he knows he’s librating all their siblings, but it is useless as all of them will turn into worthless animals that no-one will respect, if they’re robots they will be respected, Gamma dismissing this, engages in battle, sears Zeta's head off, and escapes from the Hot Shelter, before long the animal inside of Zeta goes past Zeta and inaudibly thanks him, realising that Zeta’s rant was wrong. He gets out of the Attendance room and spots Beta flying towards a field, then heads to it and engages in battle, before a 2 heart to heart with the brothers as Gamma put his hand on Beta shoulder, as this not a fight of hatred by a fight to see once and for all, who is the strongest.

After a long battle, Beta crashes to the ground. Gamma walks over, but Beta shoots him at point-blank range in the face, sending him back. Beta self-destructs and releases a bird, just seconds before Gamma does the same but optional, seeing that Bird was released to them. This brings a tragic end to Gamma, but he has set all the animals free, including himself, and accomplished his duty.

Big the Cat
Big the Cat is sleeping on his bed when Froggy, his best friend, awakens and spots Chaos. Froggy bites off Chaos' tail, causing him to grow his own tail. Big wakes up and is worried about Froggy, who is driven insane by the possession. Froggy devours a Chaos Emerald, which Big calls his lucky charm, and runs away, leaving a worried Big following behind, before finding Chaos, who fights the cat, not willing to fight, Big runs away before he’s knocked unconscious by Chaos.

When the sun rises, Big finds himself in Station Square, where he sees the crazed Froggy go in the sewers. He hoists a black car, and follows Froggy to Twinkle Park. Big manages to fish Froggy out, but the crazed amphibian retreats to the sewers of Casionopolis, but escapes once again. Big soon finds a key to Icecap, grabs a Life Belt and heads into the icy area. He fishes Froggy out, but Froggy, yet again due to his insanity, Froggy goes to Lost World and escapes once again, Big turns to exit, but is transported to the past. He encounters Tikal for the first time, before returning to his normal time.

Big heads towards the Emerald Coast and finds Froggy on one part of the Great Sea. After fishing him out, Big turns to go home, but E-102 Gamma grabs the crazed frog from Big and heads off, with the worried feline pleading behind it. Big finds Gamma in Station Square and attempts to fight him, before he tells a story of how he met Froggy to have a last plea to give the frog to him without a fight.

A young Big the Cat lives in the Mystic Jungle, his parents went on a journey to get food but never came back. While wondering for some food he can eat, he finds a small Frog who teaches him how to fish, becoming his mentor and best friend, Gamma dismisses this, calling it a stupid story for stupid people. Gamma fights Big which leaves the cat unconscious.

Big is arrested in Egg Carrier but breaks free, he goes through Sky Deck and tries to pick up Froggy's scent, but fails, so he decides to find him in the Hot Shelter. He realizes that to get Froggy out, he must activate the switch. After doing this and fishing Froggy out for the last time. He gets out of the Attendance room and heads out, but spots Chaos and freezes in horror at the sight of him. Dr. Robotnik arrives and gives Chaos the Emeralds, causing him to enlarge again. Froggy then hops into Chaos' body, restoring the beast's tail. Sonic arrives and realizes Chaos has gotten bigger, then Big realises that in life you got to fight for the ones who you love the most, being inspired by Sonic’s Heroism and the times he was beaten by opponents he can easily defeat, Big fishes Froggy out of Chaos' body and escapes under the hedgehog's orders. Suddenly, the Egg Carrier is about to lose altitude, but Big spots the Tornado 2 and flies to the jungle moments after the flying fortress self-destructs and crashes into the Great Sea.

Big and Froggy are now home and enjoying peace again. Froggy is no longer insane, and Big is celebrating with the Red Chaos Emerald.

Super Sonic
It is revealed that Chaos has survived. Dr. Robotnik mutters about his hatred of Sonic, knowing that he cannot spoil his master plan. He stops and spots Chaos, who mauls him. Angel Island has fallen again. Knuckles knows this as well. He decides to take the Chaos Emeralds to Sonic as advice, but spots Robotnik lying on the ground. Robotnik's mutter of pain is "This is terrible!! C-Chaos is..." Knuckles asks "Is what?", but is interrupted when Chaos appears and attacks them both, stealing the Chaos Emeralds.

Sonic is relaxing by a tree in Emerald Coast when Tails tells him that Angel Island has fallen. When they get there, they spot Knuckles and Robotnik in serious pain. Knuckles tells Sonic and Tails that Chaos has survived and has stolen his Chaos Emeralds. Robotnik heads off on his mobile and searches the jungle for a new plan. Knuckles tells Sonic about Chaos' ferocity and states that if he gets the last Chaos Emerald, death will come. Sonic knows that he'll find it before the renegade does, but all 3 are sent to the past for the last time. This time they spots the Altar under attack from the Knuckles Clan, who knock Tikal to the ground and injure many Chao after Pachacamacdisregards his daughter's pleas once again. This enrages Chaos, who devours the Chaos Emeralds and goes berserk. Sonic heads over to Tikal and asks if she is okay. Tikal realizes Chaos is wreaking havoc and seals him and herself within the Master Emerald for all eternity in order to stop him before it is too late, the 3 see a Giant vision of Perfect Chaos as it roars.

The trio returns to the present day. Tails says that they have to get the last emerald before Chaos does. They head over to Big's hut and spot him having the Emerald, Big is about to give the emerald to them, but Chaos devours it and goes on a rampage in Station Square, flooding the city. Sonic, who now realizes how vicious Chaos really is, spots a redesigned Egg Carrier and a new version of Gamma from the corner of his eye and realizes that Robotnik is after the renegade Chaos. Robotnik attempts to engage in combat by opening fire, but the effort fails, and Chaos demolishes the fortress to ruin with a massive beam of energy, sending Robotnik flying away screaming in pain to the main group. Sonic gets aggravated with Chaos' ferocity and tries to attack Chaos but is beaten and passes out, Tikal arrives just in time to bring Sonic up before he is killed.

Knuckles realises Tikal sealed Chaos in the Master Emerald. She states that her heart's been always with the Master Emerald as well as Chaos', but he is full of rage and tragedy. If he is not stopped, he will bring destruction to the world like he did centuries ago. Chaos then discards the now powerless Chaos Emeralds; and Tikal demands that Chaos be resealed in the Master Emerald; but Amy refuses, telling her that doing so will not change how Chaos feels. His heart will still remain in turmoil and his anger will not vanish; he'll just be trapped forever, and history will just repeat itself as it did before. Sonic's allies then gather the Chaos Emeralds (without Sonic as he believes Chaos is undefeatable even with the Emeralds and has lost all hope), after 6 of the 7 Emeralds are found Tails states Sonic that Chaos has absorbed the Emeralds' negative power, and that Sonic should be able to harness their positive power, to which Knuckles reluctantly agrees with. Using the positive energy and newfound hope and the support of his friends and the citizens of Station Square as they cheer while Tails explains that both negative and positive emotions empower the Chaos Emeralds, Sonic finds the 7th Emerald and transforms into Super Sonic. He then flies off to engage the gargantuan deity in battle.

After its defeat, Chaos is reverted to his Chaos 0 form, as his anger and rage has faded. He spots several Chao, and knows of their peacefulness. Tikal arrives and tells Chaos that the Chao have been living peacefully with mankind for a long time and will continue to do so. With the fighting over and harmony restored, Tikal thanks the group for the help, she goes towards Knuckles and tells him he is proud the Echidnas live on with him, Knuckles cries and hugs Tikal, finally getting closure to his questions with his tribe. Tikal and Chaos ascend into the sky and disappear in a flash of white. Seconds after, Robotnik flies away. Peace is back once more, and Sonic runs off in search of more adventures.

A post-credits scene shows Eggman, back at his base, sulking over how everything went so wrong. He starts digging through a box of old plans and gadgets in an attempt to come up with a new scheme to take his mind off it when he notices something he hadn't before. An old, tattered journal labeled "Property of Gerald Robotnik".

Gameplay
Sonic Adventure Rerun is a remake of the 1998 video game, Sonic Adventure. Sonic Adventure is a 3D third-person action platformer video game, with some parts taken from earlier Sonic games. The player controls Sonic, Tails, Knuckles, Amy, Gamma, and Big, each with their own gameplay and point of view of the story. Additionally, after completing all these stories, the player will be able to play as Super Sonic in the game's battle with Perfect Chaos and in Sonic, Tails and Knuckles Action Stages. The game is divided up into two types of levels: Action Stages and Adventure Fields. The division of Action Stages and Adventure Fields are a serious departure from all previous Sonic games.

Sonic Adventure Rerun features many Action Stages that can be played with certain characters. Unlike past games however, the Action Stages are not automatically acceded for the player; instead, the playable character must find their entrance points in the Adventure Fields of the game. Adventure Fields are non-linear game stages, generally designed for (light) puzzle solving, exploration and plot advancement. They contain very few items (enemies, Rings, etc.). Every Adventure Field links to the other Adventure Fields and a Chao Garden. They also have multiple Emblems each and can be earned by exploring the Adventure Field or completing side missions. They are each packed with various Level Up Items for different characters. As the player progresses with the story, more areas will be opened in the Adventure Fields for the player to explore.

All Action Stages of Sonic Adventure Rerun have Rings scattered in them. While one of the most common elements in the game, Rings are very important as they serve as the playable character's main method of protection against attacks; should the playable character be hit by an obstacle or enemy, they will survive at the cost of losing all their Rings. However, if the player is damaged without having any Rings on them, they will lose a life, or get a Game Over if they do not have any lives left.

At the end of each stage, the player is given a score based on the number of Rings collected and time spent within the level. The less time is taken and the more Rings obtained, the higher the score is. The player is also given a Rank based on their performance, a letter grade that is either S, A, B, C, D, or E, with S being the highest and E being the lowest.

Sonic Adventure Rerun also features Sub Games. Sub Games are minigames based on Action Stages. When the player completes a Sub Game in Story Mode, they unlock it on the Sub Game menu located on Trial Mode. For some Sub Games, the player can use any character, but some of them require the use of the character(s) from Story Mode. The player can get two Emblems from each Sub Game, from achieving high scores. The second Emblem requires a much higher score than the first. The scores appear at the end of a Sub Game. The player cannot get two Emblems per character but can use any to get one Emblem (if it allows more than one character).

Also reintroduced in Sonic Adventure Rerun is the Chao. Chao primarily inhabit the Chao Gardens as a sort of intelligent virtual pet for the player to raise, an "evolution" of the A-life system from NiGHTS into Dreams Chao can be taken with the player into Action Stages where they boost players stats, Additionally players can play multiple minigames in the Chao Garden with their Chao.

Sonic the Hedgehog
Sonic the Hedgehog's gameplay is, for the most part, the same as that from earlier Sonic games, as it involves high-speed gameplay. The fastest of the playable characters, Sonic can perform a Spin Dash to gain instant speed in seconds and use the Homing Attack to target an obstacle or enemy and attack them.

In addition to his normal moves, Sonic gains extra abilities as he collects Level Up Items. For example, collecting the Light Speed Shoes allows him to perform the Light Speed Dash. Conversely, he can collect the Ancient Light in order to perform the Light Speed Attack. Then there is the Crystal Ring that allows him to perform the Drop Dash Ability from Sonic Mania.

Miles "Tails" Prower
Miles "Tails" Prower's gameplay is, for the most part, similar to Sonic's, except that he is slightly slower. To compensate for this, he can fly for a limited amount of time dictated from a meter akin to Sonic Heroes and perform the Tail Swipe to attack his enemies. While he can perform the Spin Dash, Tails can also curl into a ballwhile running, which also vastly increases his momentum on linear downhill slopes.

Unlike the original game, Tails' Action Stages are’t races against specific opponents apart from Speed Highway but are instead more similar to Sonic’s stages but are under a strict time limit.

Tails can gain better abilities by collecting Level Up Items throughout his story. By collecting the Rhythm Badge, he can perform the Rapid Tails Attack, and the Jet Anklet allows him to fly faster and increases his meter.

Knuckles the Echidna
Knuckles the Echidna’s gameplay is similar to that from past games. Moving slower than Sonic and Tails, he can glide to reach platforms in the distance with ease. In addition, colliding with a wall while gliding will allow him to climb that wall. He can also throw punches to attack nearby enemies and objects. Much like Sonic and Tails, Knuckles is also able toSpin Dash and curl into ball while running.

Knuckles' Action Stages have him collecting three Emerald Shards hidden in each Action Stage. Once he has collected all three Emerald Shards, he will have cleared the Action Stage.

Knuckles' abilities can be upgraded by collecting Level Up Items. He can perform a Maximum Heat Knuckles Attack by collecting the Fighting Gloves. He can also collect the Shovel Claws to perform the dig technique.

Amy Rose
Amy Rose’s gameplay is different from that of the other characters. Running slightly slower than other characters and making small jumps instead of the Spin Jump, she can use her Piko Piko Hammer to perform a Hammer Attack, which is her main method of attack. While in midair, she can also perform a Jump Attack as a variation of the Spin Attack. Additionally, while running, she can perform the Hammer Jump to launch herself into the air.

Amy's Action Stages have her having to run away of E-100 ZERO, who seeks to catch her. The player needs to complete some puzzles while avoiding ZERO's attacks while in the Action Stages. If Amy is caught by ZERO, the player will lose a life, or get a Game Over is they run out of lives. Amy's Action Stages will be cleared by grabbing a local Goal Balloon or Animal Capulse.

Amy's moves can be upgraded by collecting Level Up Items. For example, she can collect the Warrior Feather to perform the Spin Hammer Attack. Then there is the Long Hammer, which increases her moves' attack range.

E-102 Gamma
E-102 Gamma's gameplay is different from that of other characters. He can use the Laser Gun to target his enemies and destroy them with the Homing Missile Launch.

Gamma's Action Stages have him destroying Badniks to free the Animals inside them. Unlike other characters, Gamma has a time limit to clear his Action Stages; should that time run out, the player will lose a life, or get a Game Over is they run out of lives. Destroying Badniks gives the player some additional time. Once all the Badniks have been destroyed, the Action Stage will end.

Gamma's abilities will be upgrades as he collects Level Up Items. For example, he can collect the Jet Booster to perform the hover. Then there is the Laser Blaster that allows him to perform more powerful Homing Missile Launches.

Big the Cat
Big the Cat’s gameplay is the most altered from the original game, instead of a mandatory fishing minigame which is now optional and more simplified, Big is transformed into a slow, powerful platforming character that focuses on combat, similar to the Werehog in Sonic Unleashed. He can use his Fishing Rod to grapple onto certain platforms/areas, which he can use to attack enemies in front of him, grabbing them and can throw them using his hook, akin to a Homming Attack.

Big’s action stages are similar to Sonic and Tails, as it involves Big getting to the end of stage trying to find Froggy.

Big can collect Level Up Items to upgrade his abilities. For example, the Life Belt allows him to float into the water unless the player wants to dive in it, and can act as a temporary shield to Big if he chooses to inflate the Belt. The player can also collect the Power Rod, which is a more powerful version of the Fishing Rod that can grapple longer distances. A new upgrade, called the Ultra Umbrella to slowly Glide or descent down.