Jeff Bennett

Dr. Gluckman / Martian Guard #1 / President (voice)

Corey Burton

Martian Scientist / Court Attendant / Eyes At Gate (voice)

Kathryn Fiore

Peep / Press Girl (voice)

Brad Garrett

Commander Bristle / Martian Guard #3 (voice)

Jess Harnell

Major Buzz Blister / Martian General / Worker #3 (voice)

Tom Kenny

Grob / Gardener #1 / Martian Guard #2 (voice)

Bill Kopp

Tom / Press Guy #1 (voice)

Rob Paulsen

Computer / Worker #1 / Worker #2 (voice)

Frank Welker

Spike (voice)

Billy West

Major Biff Buzzard / King Thingg / Gardener #2 (voice)