A Martian teenager named Gogo (Tommy Kirk) is sent to Earth in an usher's uniform to prepare the way for an invasion from Mars. The first Earthling he meets, one Aunt Wendy, is an eccentric rich widow who runs a dress shop. She immediately decks out Gogo - now known as George - in a swimsuit and sends him out to the beach. Her nephew, Big Lunk (Jody McCrea), is a volleyball-loving guy with little interest in romance, which causes frustration for his girlfriend Connie (Annette Funicello).

Meanwhile, Aunt Wendy's shady neighbor J. Sinister Hulk (Jesse White) and his gang (including Buster Keaton as Chief Rotten Eagle and Bobbi Shaw as Swedish bombshell Helga) concoct a scheme to part Aunt Wendy from her cash. In addition, Eric von Zipper (Harvey Lembeck) and his Rat Pack, the local motorcycle gang, want revenge on the teenagers. George and Connie began to fall for each other, Big Lunk falls for Helga, and, for the fourth time in as many movies, a giant fight breaks out at the end.

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