|John Nance||Henry Spencer|
|Charlotte Stewart||Mary X|
|Allen Joseph||Mr. X|
|Jeanne Bates||Mrs. X|
|Judith Roberts||Beautiful Girl Across the Hall|
|Laurel Near||Lady in the Radiator|
|Jack Fisk||Man in the Planet|
Henry resides alone in a bleak apartment surrounded by industrial gloom. When he discovers that an earlier fling with Mary X left her pregnant, he marries the expectant mother and has her move in with him. Things take a decidedly strange turn when the couple's baby turns out to be a bizarre lizard-like creature that won't stop wailing. Other characters, including a disfigured lady who lives inside a radiator, inhabit the building and add to Henry's troubles.