Teen aged Martian intelligence officer 006, named Gogo (Tommy Kirk), is sent to Earth wearing an usher's uniform to prepare the way for a Martian invasion. The first earthling he meets, Aunt Wendy (Elsa Lanchester), is an eccentric widow who runs a dress shop. She has Gogo, now calling himself George, get dressed in a swimsuit and sends him to the beach. There he meets her nephew, Big Lunk (Jody McCrea), who enjoys volleyball but has little interest in romance, which is frustrating for his girlfriend Connie (Annette Funicello).