Property of the Giants is an hourlong American science fiction television program lasting two seasons beginning on September 22, 1968, and end March 22, 1970. Irwin Allen made and created the show. Property of the Giants was the fourth of Allen's science fiction TV series. The show had been aired on ABC and released from 20th Century Fox Television. The show ran for 51 episodes and then was filmed in color. The show starred Don Marshall and Gary Conway. Author Murray Leinster also composed three books in 1968 and 1969 centered on the television show.