While carrying on their usual hi-jinks, they inadvertantly stow-away on a spaceship bound for Mars. They meet up with the local Martian residents and cause them to invade the Earth, aided by the "Invincitron", a vacuum-wielding giant robot. Tom, Jerry and their Martian ally, Peep, save the day.
Dr. Gluckman / Martian Guard #1 / President (voice)
Martian Scientist / Court Attendant / Eyes At Gate (voice)
Peep / Press Girl (voice)
Commander Bristle / Martian Guard #3 (voice)
Major Buzz Blister / Martian General / Worker #3 (voice)
Grob / Gardener #1 / Martian Guard #2 (voice)
Tom / Press Guy #1 (voice)
Computer / Worker #1 / Worker #2 (voice)
Spike (voice)
Major Biff Buzzard / King Thingg / Gardener #2 (voice)
