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Chaos ensues when Martin's eleven-year-old Martian nephew Andromeda (Wayne Stam), aka "Andy", crashlands on earth. Unlike Martin (Ray Walston), who is wisely hesitant to reveal his true identity, Andy cheerfully goes around telling everyone he's from Mars, and takes great delight in showing off his magical Martian skills. Martin and Tim (Bill Bixby) must figure out a way to curb Andy's enthusiasm before Detective Brennan (Alan Hewitt) swoops down. Filmed (but not telecast) as the third-season finale of My Favorite Martian, this episode was supposed to have established Wayne Stam as a regular on the series' fourth season--but the show was cancelled before this came about.