Sonic: The Animated Series is a 2-D animated series based around Sonic the Hedgehog and was aired on Cartoon Network in 2021. The cast, rather than just being the current cast, was a mix of new cast members and current cast members. The show is a slight reboot of the franchise with some changes with characters. The most notable change being Ray and Mighty's existence being retconned to where they were always members of the Chaotix Detective Agency, rather than going missing. This is technically their first appearance in a series and the first time they have been officially voiced in English. The show also brings back Hyper Sonic, albeit a different backstory. This is H. Sonic's first appearance in a show, and first voiced appearance, and Mighty and Ray's first television appearance.
Season One: In the city of Station Square, the wicked Doctor Ivo "Eggman" Robotnik suddenly appears and wants to destroy the city and replace it with a massive amusement park. Luckily, world-renowned hero, Sonic the Hedgehog and his friends are collecting the Chaos Emeralds that will give them unlimited power and help them take down Eggman. Meanwhile, Eggman begins creating the "Insanity" virus.
Season Two: After the events of Season One, Sonic's friends are going to need all hands on deck to restore their blue hero! Luckily, some new pals have arrived just in time to help!
Season Three: Silver is randomly reminded of a person called the Guardian Angel that helped him save the future. But with new heroes, comes new villains.
Sonic the Hedgehog (voiced by Jason Griffith, later replace by Max Mittelman) - Sonic is an easygoing, fun-loving hedgehog. He is the fastest thing alive and he can always confide in his friends. He is 15 years old and may or may not have a crush on Amy Rose. His other forms include Dark Sonic, Fleetway Sonic, Super Sonic, and Hyper Sonic.
- Fleetway Sonic (voiced by Nathan Morrison) - Sonic's inner insanity takes form in Fleetway Sonic, a violent, murderous creature, "created" by Dr. Eggman.
- Dark Sonic (voiced by Paxton Lee) - After being subjected to negative energy from the Chaos Emeralds, Sonic turns into Dark Sonic, a physical representation of Sonic's anger.
Miles "Tails" Prower (voiced by Kennie Mackennnith) - Tails is an 8 year old fox born with a birth defect that gives him twin tails. As a result, the young inventor was bullied while he was younger. After meeting Sonic, Tails has become much more confident in his abilities.
Knuckles the Echidna (voiced by Dan Green, later replaced by DragonSuperFan) - Knuckles is the last surviving member of an ancient clan named the Echidna Clan and the current guardian of the Master Emerald. He is 16 years old.
Amy Rose (voiced by Katie Herbert) - Amy is a pink hedgehog and admittedly a hopeless romantic, thinking the power of love and romance can overpower anything, Although, she realizes otherwise in Season 2, she still thinks that love is powerful, even if it isn't always the answer. She has a massive crush on Sonic. She is 13 years old.
Cream the Rabbit (voiced by Tara Strong) - Cream is the daughter of Vanilla. She is incredibly kind-hearted and always strives to see the best in everyone. Her best friend is a Chao named Cheese. She is 6 years old and is the youngest female in the cast.
Chao (vocal effects by Michelle Ruff) - Chao are incredibly adorable creatures that inhabit Station Square. The Chao that appears most often is Cheese the Chao, Cream's best friend and companion. Chao are non-binary and can reincarnate after 5 Chao years if they had a good life. Cheese specifically uses he/him pronouns.
Big the Cat (voiced by Kyle Hebert) - Big is a big cat with a big heart. He is very kind and loves his pet frog, creatively named "Froggy". Big's favorite hobby is fishing and he brings his rod with him everywhere. He is 18 years old.
Froggy's vocal effects are by Dee Bradley Baker.
Shadow the Hedgehog (voiced by SuperVintendo64) - Shadow was created by Dr. Gerald Robotnik as a cure for his granddaughter Maria's rare disease. GUNmen raided the ARK where they lived and one of the men shot Maria to death. Maria sent Shadow down to Earth so he would be safe. Shadow suffers from PTSD, because of Maria's death, but he finds support in his friends and his "siblings" Rouge and Omega. Shadow is technically over 50 years old and is technically immortal, but he is physically 16 years old. His other forms include Chaos Shadow, Hero Shadow, and Super Shadow.
Rouge the Bat (voiced by Skylar Tourai) - Rouge is a jewel thief that also works for GUN. She is incredibly seductive and knows how to get men flustered. She, Shadow, and Omega are as close as siblings. Rouge is 16 years old.
Espio the Chameleon (voiced by Grant Paulsen) - Espio is a member of Team Chaotix and the Chaotix Detective Agency. Out of all of his friends, he typically takes missions the most serious. Espio is incredibly skilled at combat and is 16 years old.
Vector the Crocodile (voiced by Keith Silverstein) - Vector is the leader of Team Chaotix and the Chaotix Detective Agency. While he isn't as intelligent as Espio, he is very good at combat, like Espio. He is 17 years old.
Charmy Bee (voiced by Colleen Villard) - Charmy is the youngest member of Team Chaotix and the Chaotix Detective Agency. He is very hyperactive, loud, and impulsive. Even though he can be a bit annoying at times, he is still a respected member of the Chaotix. He is 6 years old and the youngest male in the cast.
Mighty The Armadillo (voiced by Timothy Thomas) - Mighty is a member of the Chaotix Detective Agency and Team Chaotix. Mighty loves solving mysteries, and is always willing to help! Mighty hates violence, and really doesn't like missions that require fighting, even though he is very good at combat.
Ray the Flying Squirrel (voiced by Courtenay Taylor) - Ray is the second youngest member of Team Chaotix and the Chaotix Detective Agency. While he isn't the best at combat, he is very kind and is the best friend of Mighty the Armadillo. He is 12 years old.
Team Robotnik/Eggman, Eggman Empire
Dr. Ivo "Eggman" Robotnik (voiced by Mike Pollock) - Enter the most wicked man alive, Dr. Robotnik, nicknamed "Eggman" by Sonic and eventually adopting the name for himself. His only goal is to destroy Station Square and replace it with a ginormous and endless amusement park that stretches across the universe.
Metal Sonic (voiced by Jason Griffith, later replaced by Max Mittleman) - Metal Sonic is a replica of Sonic created by Dr. Eggman. He was made to rival Sonic in every way possible. The only difference between the two is their personalities. After Tails manages to alter Metal's code, Sonic's personality slowly begins to take over Metal until Metal realizes that he isn't the true Sonic.
Orbot (voiced by Kirk Thorton) - Orbot is one of Eggman's robot lackeys. He is usually neglected by Eggman, and most of the time has better plans than Eggman, even though Eggman always calls his ideas "ridiculous". Regardless, Orbot is loyal to Eggman.
Cubot (voiced by Wallace E. Wingert) - Cubot is one of Eggman's other lackeys. He is less intelligent than both Eggman and Orbot and has a faulty voice box. He is loyal to Eggman and rarely ever speaks against Eggman.
The Babylon Rogues, Team Babylon
Jet the Hawk (voiced by Todd Haberkorn) - Jet is the the leader of the latest generation of the Babylon Rogues. He is Sonic's friendly rival, and is the most experienced at using Extreme Gear out of the main cast. Jet is 15 years old. Despite how sort of cold he seems, Jet is a genuinely caring person who cares a lot for his teammates and people who are close to him, and would seriously hurt anyone who would try to hurt them. He and his friends Wave and Storm are as close as siblings.
Storm the Albatross (voiced by Chase Young) - Storm is the strongest member of the team, but that sadly come to the expense of his intelligence. While Storm isn't flat out stupid, it does take him longer to understand some things then his teammates. He is 15 years old.
Gadget the Wolf (voiced by Bryson Baugus) - The "leader" of Team Avatar. Gadget admires the heroes of the main cast, and aspires to be like them. His best friends are Fuchsia the Cat and Corvin the Bird. Gadget is a bit of a coward, and somewhat lacks self-confidence, but after meeting Sonic, and going on missions with him and his friends, Gadget has become much more confident. He is 14 years old.
Fuchsia the Cat (voiced by Tara Strong) - Fuchsia is best friends with Gadget and Corvin. Fuchsia is more confident than Gadget and acts as his "personal cheerleader", in her and Gadget's own words. She admires the heroes of the main cast and aspires to be like them. She is 14 years old.
Corvin the Bird (voiced by Max Henderson) - Corvin is best friends with Gadget and Fuchsia. Corvin is the most confident in his abilities, and sometimes acts before thinking, similarly to Sonic. He is 14 years old.
Maria Robotnik (voiced by Adriana Figueroa) - Maria is the main source of Shadow's trauma. Maria was the granddaughter of Gerald Robotnik. Maria had a pure soul and gold heart and longed to see the Earth. When GUNmen raided the ARK, Maria was shot twice. In the head, and in the chest. She was 12 years old. Her final words were "Sayonara, Shadow the Hedgehog."
Gerald Robotnik (voiced by Matthew Patrick) - The man responsible for the events of SA2 is Gerald Robotnik. He was the creator of the Biolizard and Shadow the Hedgehog. After Maria died, Gerald went insane and altered Shadow's memory, so Shadow would think Maria wanted world dominarion. After leaving behind his last video, he committed suicide.
Tangle the Lemur (voiced by Karen Fukuhara) - Tangle is a lemur that lives in Station Square. She was recruited by Sonic's friends to help them take down Fleetway. She became very close to the main cast throughout the season. In Season 3 she formed a crush on Whisper the Wolf, of whom she protects from Mimic.
Silver the Hedgehog (voiced by Paxton Lee) - Silver is the hero of the future. He is the Future's equivalent of Sonic. After managing to save his future, he helps surviving citizens. His best friend (and eventual romantic partner) is Blaze the Cat. He travelled to the past/present to help save Sonic. Silver is 14 years old.
Blaze the Cat (voiced by Erica Lindbeck) - Blaze is the heroine of the future and the princess of the Sol Dimension. She is the Sol Dimension's equivalent of Knuckles. Blaze has a strong connection to the Sol Emeralds (the Sol Dimension's equivalent of the Chaos Emeralds), which "speak" to her whenever someone or some place is in danger, which is how she met Silver. She is 14 years old.
Whisper the Wolf (voiced by Miss MasterPeace) - Whisper is one of the only surviving members of the Diamond Cutters, an anti-Eggman group. Whisper survived the betrayal of her closest friend, Minic, but lost all of her other teammates. After the event, Mimic went missing before making his grand return in Season 3. Whisper has a crush on her best friend Tangle the Lemur, who unbeknownst to her, feels the same way.
Dr. Starline the Platypus (voiced by Wolfblade93) - The secondary antagonist of Season 3. Dr. Starline sees himself as Dr. Eggman's superior. He believes that Eggman's plans are lackluster and a true wicked genius (which he believes he is) what never have such horrendous plans. His weapon of choice is the Warp Topaz, which can create portals and warp reality for someone or multiple people. His most treasured possession was the cause of his defeat, as Mimic trapped Starline in Nullspace, where he went insane after Nullspace's equivalent of years.
Mimic the Octopus (voiced by Billy Kametz) - The main antagonist of Season 3 is none other than Mimic the Octopus. After betraying his friends for unknown reasons, Mimic went into hiding for many months. Similarly to Infinite, Mimic thrives on the fear of others and enjoys tormenting anyone who dares to oppose him. Mimic's mind is an enigma, as he simultaneously shows no remorse for murdering his friends, and also has showed remorse on more than one ocassion.
Rough the Skunk (voiced by Jim Sass) - Rough, and his older brother, Tumble, are the henchmen of Mimic the Octopus (formerly Dr. Starline). Rough, ironically, is the less rough brother of the duo. While he isn't necessarily calm and quiet, he isn't as quick to violence as Tumble is. Rough is 16 years old.
Tumble the Skunk (voiced by LuckoDaStars) - Tumble, and his younger brother, Rough are the henchmen of Mimic the Octopus (formerly Dr. Starline). Tumble, as you'd probably expect, is an excellent acrobatic. Despite being Rough's same age, he was born minutes before Rough, so he is technically older than him.
The composers of the score, Aivi Tran, Steven "Surasshu" Velema, and Grant Henry, took the same approach as the three did with Steven Universe. Each character, or set of characters has their own leitmotif and instrument associated with them. The music's attention to detail was praised.
- A number of the cast are members of the LGBTQIA+ community. Some have been in confirmed in the show or by people working on the show, and some are heavily implied (e.g. Tangle and Whisper are canonically a bisexual couple, Rouge and Silver heavily implied to be pansexual characters.)