The disappearance of scuba divers and sightings of strange coloration and other phenomena at sea attracts the attention of the Institute for Oceanic Research, where “Mark Harris” is still being studied by Dr. Elizabeth Merrill. One of the divers turns up dead, while the other two resurface, now with physical similarities to Mark, including a dependence on being underwater, webbed hands, and other powers. They quickly prove to be dangerous, even to Mark himself. He finds their base – a submerged spacecraft from another planet – containing evidence that they are from the same place as him. Once captured, they admit this as well, and claim to be among the last survivors of Mark’s home planet, adrift and looking for a new home to colonize. Torn between the promise of learning more about his origins, or maintaining the trust of his new human allies, Mark faces an agonizing choice.
written by Robert Lewin
directed by Marc Daniels
music by Fred Karlin
Cast: Patrick Duffy (Mark Harris), Belinda J. Montgomery (Dr. Elizabeth Merrill), Kenneth Tigar (Dr. Miller Simon), Alan Fudge (C.W. Crawford), Tiffany Bolling (Lioa), Burr DeBenning (Xos), Stanley Clay (Boy), Alan Mandell (Grant Stockwood), Annette Cardona (Ginny Mendoza), Hank Stohl (Sub Captain Wes), Russell L. Arms (Medical Examiner), Arch Archambault (Second Officer), Michael J. London (Air Lock Man), Vincent Deadrick (Herb Wayland), Maurice Hill (Lou), Joel Lawrence (Hot Tub Manager), Maralyn Thoma (Myrtle), Dick Winslow (Fish Store Clerk)
LogBook entry by Earl Green