As Fenton figures out how to be a hero, Mark Beaks offers to hire Gizmoduck and help him defend all of Duckburg.

With Huey’s and Webby’s help, Fenton woos a punk-rock scientist, Gandra Dee, only to uncover her dangerous plans for Gizmoduck.

The moon invades Duckburg, forcing Scrooge to join forces with an unlikely ally in an effort to save the earth. Meanwhile, Della and the kids search the globe for reinforcements.

Huey struggles to keep Fenton and Gandra’s top-secret experiment (and their relationship) hidden from the world. But, Mark Beaks is desperate for one last gizmo to steal.