Guest Stars Keith Ferguson voices Flintheart Glomgold Jim Rash voices Gyro Gearloose Kimiko Glenn voices Lena Lin-Manuel Miranda voices Fenton Crackshell-Cabrera / Gizmoduck Marc Evan Jackson voices Bradford Buzzard Catherine Tate voices Magica De Spell Margo Martindale voices Ma Beagle David Kaye voices Duckworth Libe Barer voices Violet Sabrewing Julie Bowen voices Penumbra April Winchell voices Black Heron Chris Diamantopoulos voices Storkules Eric Bauza voices Beagle Boys Paul F. Tompkins voices Gladstone Gander Keith Ferguson voices Johnny Jameela Jamil voices Gandra Dee Chris Diamantopoulos voices Drake Mallard/Darkwing Duck Chris Diamantopoulos voices Eggheads April Winchell voices Eggheads Keith Ferguson voices Eggheads Jaime Camil voices Don Karnage Corey Burton voices Ludwig Von Drake John Hodgman voices John Rockerduck Keith Ferguson voices Randy Giancarlo Esposito voices Phantom Blot Jason Mantzoukas voices Steelbeak Amy Sedaris voices Pepper Tom Kenny voices Cousin Fethry Corey Burton voices Rescue Rangers Arturo Del Puerto voices Panchito Pistoles April Winchell voices Rescue Rangers Jaleel White voices Gene The Genie Tress MacNeille voices Daisy Duck Bernardo de Paula voices José Carioca Noah Baird voices B.O.Y.D. Stephanie Beatriz voices Gosalyn Waddlemeyer Retta voices Harp Keith Ferguson voices Frankenjeeves Jim Rash voices Gizmoduck Armor Riki Lindhome voices May Tom Kenny voices Egghead Stiv Noël Wells voices June Keith David voices Manny