Carlos Smith, a half-alien living in San Marco, is rescued from suspicious townspeople by his alien half-brother, but chooses to remain on Earth.; Peter Rogers, a banker, has amnesia that gives him precognition of the future. As Mr. Smith, he builds mechanical toys that appear to cause the disasters that he predicts.; Larry Gales, an actor, is taken over by the spirit of his ancestor, Lucius Gallus, to defeat his ancient enemy Cassius Petronius.; When a plane crash-lands on a mysterious island, chemicals from the plane and a lagoon cause changes in living tissue that resemble the tale of Circe.