Not long after a now thwarted robbery and Violet's reconcile movie date with Tony, with Supers re-legalized, super-villainy is back on the rise.

One day, the Underminer returns. With the use of his technology and the money he embezzled from the Bank of Municiberg, the Underminer created greater devices to conquer the surface. Drills rise across the city and newly built subterranean robots follow to terrorize the populace. Once more, it's time for the Incredibles and Frozone to go into action. They split up; Mr. Incredible and Frozone chase down the Underminer (through his robot minions and underground lairs) while Elastigirl and the kids try to stop the drills.

Through the underground, Mr. Incredible and Frozone fight their way through subterranean robots and underworld doomsday devices(Magnomizer, Giant Robot Factory, and Corruptorator). Meanwhile, on the surface, Violet, Dash, and Jack-Jack are captured by their dad's old supervillain enemy, Bomb Voyage (who'd been waiting to return to villainy to avenge himself against Mr. Incredible). Bomb Voyage captured Mr. Incredible's kids to destroy them and then Mr. Incredible (who'd suffer a heartache first).

After chasing down the Underminer, he tries one 'Last Ditch Effort' to destroy Mr. Incredible and Frozone with a giant robot, only to be defeated and assumed dead from the collapsed robot. When Elastigirl catches up to them and tells them about Bomb Voyage and the kids, Mr. Incredible decided to go at it alone (since he was the one Bomb Voyage wanted, for old times).

Mr. Incredible and Bomb Voyage met up and made a deal: They fight; if Mr. Incredible wins, his kids go free and Bomb turns himself in. If Bomb Voyage wins, Mr. Incredible dies alongside his kids. During the intense battle, Bomb seem to get the better of Bob. However, during such, Violet, Dash, and Jack-Jack escape their imprisonment. Right when it seems all hope is lost for Mr. Incredible, his kids give Bomb Voyage a fight he'd never forget. With the damage to the city (by the Underminer) being repaired, the Incredibles turn in Bomb Voyage and return to their lives.

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