"Dr. Morbius" (Walter Pidgeon) and his daughter "Altaira" (Anne Francis) are getting along fine on their planet of "Altair 4" when they receive a radio signal from an incoming ship. Despite being given the cold shoulder, they land and are soon enquiring as to where the remainder of the expedition went. He informs the captain "Adams" (Leslie Nielsen) and the doctor "Ostrow" (Warren Stevens) that they all died mysteriously, including his own wife, but that things were all settled now. The visitors are far from satisfied, and with a few of them vying for the affections of the young woman complete...