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A Martian invasion of Earth is planned, and Go-Go is the envoy sent to prepare the way. He lands in Aunt Wendy's garden and meets Big Lunk, her muscular nephew, and his friend Connie. Aunt Wendy, an eccentric who owns a dress shop, is reputedly hiding a small fortune in her house, and therefore she is the object of a robbery plan by con men J. Sinister Hulk and Fleegle. There is also trouble brewing from motorcycle gang leader Eric Von Zipper, who is jealous of Big Lunk's affection for Connie. Meanwhile, Go-Go tries in vain to convince Aunt Wendy and Connie that he is really a Martian and that an invasion is imminent. Aided by Chief Rotten Eagle and Helga, a sexy Swede sent to pry information from Big Lunk about the hidden money, the con men crash a pajama party given by Aunt Wendy for the teenagers; but Go-Go saves the day by "teleporting" the would-be robbers to Mars. The motorcycle gang and Eric Von Zipper are also dealt with, and Go-Go persuades the Martians to call off the invasion. Go-Go, who has fallen in love with Connie, decides to stay on Earth, and Big Lunk wins the affection of Helga, who does not understand English.