This is a sequel to episode #13, "The Gift", which was written by Ray Bradbury.
This episode was intended to be broadcast after Episode #28 "STRIKE FORCE", as it refers to events from that story, but the airing of STRIKE FORCE was delayed due to the studio awaiting clearance from the Air Force for the use of "sensitive footage". In fact, IRON CURTAIN was aired in place of STRIKE FORCE which was originally scheduled for that date.