The residents of a small town are excited when a flaming meteor lands in the hills, until they discover it is the first of many transport devices from Mars bringing an army of invaders invincible to any man-made weapon, even the atomic bomb.
In New York, Felix, a neurotic news writer who just broke up with his wife, is urged by his chaotic friend Oscar, a sports journalist, to move in with him, but their lifestyles are as different as night and day are, so Felix's ideas about housekeeping soon begin to irritate Oscar.
In this film based on a Neil Simon play, newlyweds Corie, a free spirit, and Paul Bratter, an uptight lawyer, share a sixth-floor apartment in Greenwich Village. Soon after their marriage, Corie tries to find a companion for mother, Ethel, who is now alone, and sets up Ethel with neighbor Victor. Inappropriate behavior on a double date causes conflict, and the young couple considers divorce.
