Negaduck, Bushroot, Quackerjack, Megavolt, and Luqidator all join together as the Fearsome Five to defeat Darkwing Duck and take over St.Canard. When the other superheroes hear about this Neptuna, Gizmoduck, Morgana, and Stegmutt band together to fom the Justice Ducks. Darkwing is less than thrilled, however, wanting all the credit for their defeat. But when he faces the Fearsome Five, he soon finds out the job is more than he can handle.