Plot: 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.
Alternative Plot: Tom and Jerry stow away on a manned mission to Mars and discover that man is not alone in the universe and that Martians do exist.
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