Shazam! is a half-hour live-action television program that was produced for Saturday Mornings by Filmation (the studio's first non-animated series), based on the superhero Captain Marvel, now known as Shazam, of Fawcett Comics' comic book series Whiz Comics (now owned by DC Comics). The program starred Michael Gray as Billy Batson, a teenage boy who can transform into the superhero Captain Marvel, originally played by Jackson Bostwick and later by John Davey, by speaking the magic word "Shazam!" With his guardian "Mentor" (Les Tremayne), Billy travels the country in a 1973 Dodge Open Road motorhome, looking for injustices to resolve.The show ran from 1974 to 1976 on CBS's Saturday morning lineup. From 1975 to 1977 it was known as The Shazam!/Isis Hour and included The Secrets of Isis, about an Ancient Egyptian superheroine resurrected in the body of a schoolteacher, as the second half of the hour.