Gogo (Tommy Kirk) is a teenager from Mars sent to Earth to pave the way for an invasion. Upon landing, the bewildered visitor becomes besotted by a chipper beach town. Gogo befriends a kindhearted widow and shop owner named Aunt Wendy (Elsa Lanchester), whose fortune is coveted by the aptly named Chief Rotten Eagle (Buster Keaton). After she has dressed him in some sharp surf attire, Gogo takes to the beach, where he soon falls for a beautiful local (Annette Funicello).