Epic Mickey 2: The Power of Two

All has been well in the Wasteland since Mickey Mouse saved it from destruction by the Shadow Blot, with the world's inhabitants beginning its restoration. However, a series of earthquakes have been occurring lately. The Mad Doctor, revealed to be still alive, arrives and claims he has reformed. He requests Oswald the Lucky Rabbit to collaborate with him in order to save Wasteland from this new threat. Not trusting the Mad Doctor, Gus, the leader of the Gremlins, and Ortensia, Oswald's wife, contact Mickey for assistance. Mickey enters Yen Sid's workshop once more and takes back the Magic Paintbrush to aid him as he returns to Wasteland. Oswald joins up with them in Dark Beauty Castle, explaining the Mad Doctor warned him of Blotworx, Blotlings piloting Beetleworx-like battle mechs. The castle begins collapsing from an earthquake, forcing them to escape while Oswald retrieves his remote en route.
Mickey and Oswald arrive in Mean Street via the train, where Gremlin Jamface advises them to fix the disabled projector travel network via their control station in Rainbow Falls. They fight their way through Wasteland to accomplish this, battling various Blotworx. After heading to the Mad Doctor's laboratory in Disney Gulch and defeating a Blotworx dragon, they find out the projectors were intentionally sabotaged, with evidence pointing to OsTown's grumpy caretaker Gremlin Prescott, whom the heroes had earlier caught assembling a secret television device. The group follow him to Fort Wasteland, an area abandoned during the Blot's revolt, and onto the Floatyard, where they find Prescott has built a gigantic battle mech modelled after himself. Confessing to the projectors' sabotage, he accuses Gus of never recognizing his potential and battles the heroes.
After trapping or destroying his creation, the group attempts to interrogate Prescott, only for Wasteland's news team and the Mad Doctor to arrive. One of the Mad Doctor's Beetleworx places Prescott in a hypnotic trance, making him publicly confess to being behind the chaos – which convinces everyone except for Mickey's group. The Mad Doctor announces he will be building a new attraction in celebration and Wasteland's inhabitants begin to accept him as their leader instead of Oswald, to his dismay.
Gus goes through Prescott's belongings and retrieves blueprints that suggest his main project was not the mech, but rather an undercover operation in Ventureland. Mickey and Oswald follow the trail through Ventureland, which leads them to Autotopia, a region that was presumed to be destroyed during the Blot's revolt. There, they witness mechanical siphons erected by Prescott pumping Wasteland's primeval spirits, the Guardians, out of the ground. These machines were disrupting the foundation of Wasteland and causing the earthquakes. After disabling them, the team discover a secret projector set up by the Mad Doctor; travelling through, they learn what happened to the Mad Doctor following his previous defeat. He crash-landed in Disney Gulch and set up his lab there, creating the Blotworx as part of a plot for revenge, but was forced to cast them out due to their hostility.
In the attic of Lonesome Manor, which has been retooled into a secret television studio, they find the Mad Doctor's diary, from which they learn of his true intentions. He manipulated Prescott into building him the television device in order to broadcast a television program, 'The Wonderful World of Evil,' into Mickey's world, to bestow upon him fame and thus a new heart, allowing him to escape Wasteland. Wanting to become a Toon again after discovering that his Beetleworx form had begun to deteriorate, the Mad Doctor schemed to capture the Guardians in Autotopia as he knew they would have the power to restore him.
Mickey and Oswald confront the Mad Doctor at his new attraction, now revealed to be a doomsday device intended to destroy Wasteland upon his departure. He demands the brush from Mickey in exchange for sparing the citizens trapped on the ride. Mickey is prepared to hand it over, but Oswald prevents the exchange at the last second. The duo then defeat the Mad Doctor, whose Beetleworx form finally gives out and is either killed or redeemed depending on which path is taken in his fight. If redeemed, the Mad Doctor saves the heroes from falling into a thinner pool and his Toon form is restored by the freed Guardians. In the aftermath, all of Wasteland celebrates Mickey and Oswald's triumph with a parade highlighting the duo's major choices throughout the game.
In a post-credits scene, the Petes of Wasteland (with Petetronic being present if the thinner path was taken) take Prescott hostage.