Iconic comic book hero Captain Marvel made his small-screen debut in this well-remembered Saturday morning series that aired on CBS from 1974-1976. Young Billy Batson (Michael Gray) and his mentor, Mentor (Les Tremayne), traveled the highways in an RV offering help to those in need, and when danger surfaced, Billy uttered his magic word to transform into the World's Mightiest Mortal (Jackson Bostwick for the first season, then John Davey).