 In the episode "Man On A Punched Card" Maitland hires computer programmer Terry Kerwin to track and predict Richards' movements using a mainframe computer.Kerwin was played by Christopher George's real-life wife Lynda Day George, who would co-star on another Paramount TV series "" from 1971 to 1973.The plotline of "The Immortal" is quite different from that of the book on which it is based (the protagonist of the book was a vagrant, not a test driver, who discovers his immortality when he sells his blood).