On a remote island, a maiden is sacrificed by a primitive tribe to an unearthly beast in a coastal cave. The Cetacean is sent to investigate the seafloor near this island, searching for something completely unrelated, but the trail leads Mark ashore and into contact with the natives. Their tribal leader is determined to cast Mark out as a demon, while Mark patiently tries to prove otherwise. When he, too, is taken to the cave as a sacrifice, he meets the creature that lives there, and discovers the real devil in the details: unscrupulous treasure-hunter Captain Jack Muldoon has set himself up as the local tin god, on the receiving end of maidens and valuable finds alike.
Cast: Patrick Duffy (Mark Harris), Belinda J. Montgomery (Dr. Elizabeth Merrill), Alan Fudge (C.W. Crawford), Ted Neeley (Jack Muldoon), Ted Cassidy (Canja), Tony Urbano (Oscar), Eugenia Wright (Trivi), Yabo Obien (Toba), Richard Laurance Williams (Jomo), J. Victor Lopez (Chuey), Jean Marie Hon (Jane)
LogBook entry by Earl Green