Golden Sun (Nintendo Cinematic Universe)

Golden Sun is a Japanese anime series.

The Broken Seal
A group of Adepts are sent on a quest to protect Weyward from the destructive Alchemy.

The Lost Age
A re-telling of The Broken Seal with Felix in the lead role.

Dark Dawn
The children of the previous seasons' heroes must now band together against Tuaparang.

The Broken Seal

 * Saturos and Menardi storm Mt. Aleph to seize the Elemental Stars for themselves but fail to solve the riddles guarding the stars and are driven away by the mountain's trap, a magically generated thunderstorm and rockslide.
 * Three years later, Isaac, Garet, and Jenna join their teacher, Kraden, in his research of Mt. Aleph.
 * Their research coincides with a second raid of the sanctum by Saturos and Menardi, now assisted by Felix and Alex, who coerce Isaac into giving them three of the four stars.
 * The volcano erupts before they can retrieve the final star, but before escaping, Saturos and Menardi capture Jenna and Kraden as eventual bargaining chips.
 * The guardian of Mt. Aleph, the Wise One, instructs Isaac and Garet to prevent Saturos' group from casting the Elemental Stars into their respective Elemental Lighthouses across Weyard; if this happens, Alchemy will be restored and the period of instability will begin anew.
 * Isaac and Garet pursue Saturos' group to the Mercury Lighthouse, joined by Ivan.
 * Despite their best efforts, they fail to prevent Saturos from activating Mercury Lighthouse with the Mercury Star.
 * Saturos' group leaves for the next Lighthouse with Isaac's party remaining in pursuit.
 * In the ensuing chase, Isaac learns that Saturos has taken another Adept hostage: the female Jupiter Adept, Sheba.
 * Saturos and Menardi activate the Venus Lighthouse with the Venus Star, and are confronted by Isaac's party immediately thereafter.
 * Attempting to annihilate their opponents, Saturos and Menardi magically merge to form a massive two-headed dragon, but Isaac's party slay Saturos and Menardi and rescue Sheba.
 * The remnants of Saturos' group, headed by Felix and Alex, continue their quest to light the remaining two Lighthouses, with Jenna, Sheba, and Kraden still with them.
 * Isaac's party boards a ship and sail out into Weyard's open seas to continue their mission.

The Lost Age

 * Two of the four Elememntal Lighthouses have already been activated.
 * Jenna, Felix's younger sister, has joined her brother to complete Saturos and Menardi's original mission, along with Sheba and Kraden.
 * Felix is finally able to explain to Isaac why Alchemy's release is a necessary thing for everyone, and that Saturos and Menardi were aiming for this goal merely for the sake of the survival of their home colony of Prox to the far north, located near the Mars Lighthouse.
 * He also reveals that his parents and Isaac's father are alive and currently being held hostage in Prox in order to coerce Felix's initial cooperation.
 * Isaac and his company agree to aid Felix, and the group sets out north to activate the Mars Lighthouse.
 * The group discovers that Karst and Agatio have been transformed into mindless dragons and are forced to defeat them - they return the Mars Star before succumbing to their wounds.
 * When they reach the tower's top, the Wise One, the entity responsible for originally tasking Isaac to prevent the breaking of Alchemy's seal, confronts them. He warns them that mankind could very well destroy Weyard themselves if they had possession of such a power, and when Isaac insists on breaking the seal regardless the Wise One summons a giant, three-headed dragon for the party to battle in the final struggle.
 * After slaying the dragon, the party of Adepts finish their objective and activate Mars Lighthouse; with all four towers across Weyard lit, the process that heralds the return of the force of Alchemy to Weyard ensues at the mountain sanctum Mt. Aleph.
 * Alex is there, however; he took advantage of everyone else's quests so that he would gain immense power for himself from the light of the Golden Sun, a manifestation of Alchemy itself.
 * However, Alex discovers that the Wise One had taken steps to prevent this and is left to die as the mountain sinks into the earth.

Dark Dawn

 * When Tyrell accidentally breaks a flying machine critical to Isaac's work, Isaac sends his son, Matthew, and Matthew's friends to find a rare Mountain Roc feather required to fix it. They are instructed to head to the nearby Konpa Ruins to meet Isaac's mentor Kraden and Mia's children Rief and Nowell. However, they are ambushed by three mysterious Adepts named Blados, Chalis, and Arcanus.
 * The group is separated.
 * Matthew, Tyrell, Karis, and Rief are trapped on the southern half of the continent, the opposite of where they want to be.
 * Kraden and Nowell are stuck in the north.
 * Seeking to reunite with the latter two, Matthew and his party enlist the help of the enigmatic Prince Amiti to cross into the Morgal region, home of the beastmen.
 * In Morgal, the group meets Felix's one-time enemy, the pirate captain Briggs, who enlists their aid in rescuing his son Eoleo from captivity in the Morgal capital of Belinsk.
 * The group is also guided to the Mountain Roc by a part-beast woman named Sveta, who refuses to attack the beast because it is considered divine in her culture.
 * Matthew and his party successfully steal a feather from the Mountain Roc, completing their original quest.
 * In Belinsk, Matthew regroups with Kraden, who reveals that Nowell has remained in the company of his old friend Piers.
 * They attempt to sneak into Morgal's castle through an underground labyrinth with Sveta's aid, but Blados, Chalis, and Arcanus reappear.
 * Tauparang activates the Alchemy Dynamo hidden in the ruins, triggering the Grave Eclipse and causing death and suffering across much of the continent. Morgal's king Volochek, who is revealed to be Sveta's older brother, and Briggs both sacrifice themselves to allow Matthew and his group to escape; in response, Eoleo swears revenge for his father's death and joins Matthew's party.
 * Sailing the oceans of Weyard, Matthew's party learns that the only way to stop the Grave Eclipse is by using the Apollo Lens, an alchemy machine powered by the Alchemy Forge and the Alchemy Well. In order to reach the Apollo Lens, they must find the legendary Umbra Gear.
 * With the aid of a priestess named Himi, they are able to find the Umbra Gear and reach the Lens.
 * The group confronts and slays Blados, Chalis, and their beast companion, the Chaos Hound.
 * Matthew and Sveta both attempt to activate the Apollo Lens, but fail.
 * The Chaos Hound, revealed to be a brainwashed and mutated Volochek, sacrifices himself to activate the Apollo Lens, and the Grave Eclipse ends.
 * Matthew, Karis, and Tyrell part ways with their friends to return home to find Isaac and Garet missing and an unusually large Psynergy Vortex greeting them.

The Broken Seal

 * Based on Golden Sun.

The Lost Age

 * Based on Golden Sun: The Lost Age.

Dark Dawn

 * Based on Golden Sun: Dark Dawn.