Little Carol Ann Harris was a normal, little girl whose uncle, Doctor Matthew Carlson, was a psychiatrist at the Pleasant Valley Sanitarium.One day, a patient of his, who's a dead-ringer for Carol Ann Harris, little Holly Anne Peterson meets Carol Ann Harris and soon hatches an escape scheme where she assumes Carol Ann's identity, switches clothes with her, and in turn, "Switches Places", with Carol Ann, and now Carol Ann Harris must race against time to foil Holly Anne Peterson's plot and get her identity back.