Tom plays championship tennis against a cigar-smoking bully, but both cats find themselves battling Tom's much-abused lackey, Jerry Mouse, for the trophy.
The popular cartoon cat and mouse are thrown into a feature film. The story has the twosome trying to help an orphan girl who is being berated and exploited by a greedy guardian.
The Oscar-winning cat-and-mouse twosome-Tom and Jerry-returns with another adventure. When Tom and Jerry's irrepressible curiosity gets the best of them, the mysterious magic ring that Tom guards with his life ends up stuck over Jerry's head. Now, Jerry must find a way to free himself of the ring while fleeing Tom, who wants to remove the ring any way he can! Find out if the pair can conjure up a solution in this fur-raising, madcap escapade.
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.
As Tom and Jerry stage their typical fight sequences, the patriotic soldier theme of the title is evidenced by such things as a carton of eggs labeled "Hen Grenades"; Jerry dropping light bulbs from an airplane like bombs; and Jerry sending a telegram with the message "Sighted Cat - Sank Same." Musical phrasings from various patriotic war songs are heard throughout.
Tom, sick of Jerry stealing the milk out of his bowl, poisons it. Instead of killing the mouse, the potion transforms him into a muscular beast.
Tom is playing with Jerry when a cute lady cat is delivered to Mammy for her to take care of. Tom is smitten at first sight.
The family dog warns Tom not to make any noise so he can take a nap. Jerry hears this and immediately devises plans to ensure that the dog's nap will be interrupted.
It's spring, and Tom is much more interested in the female cat next door than in Jerry.