Dr. Jackal is working on a formula to make short people tall, but when he tests it on himself, he transforms into a monster, causing his assistants Tom and Jerry to run for their lives./While running from Spike, Tom and Jerry find themselves on a NASA rocket headed for the planet Dogstar, where the canine inhabitants of the planet are being brainwashed by a giant talking idol into believing that cats and mice are their enemies./While camping, Tom and Jerry are bedeviled by a mosquito who resists their attempts to get rid of him.