Wikipedia
Shazam! is a half-hour live-action television program produced by Filmation (the studio's first such program), based upon DC Comics' superhero comic book series of the same name. 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 1977 on CBS' 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. Joanna Cameron, the star of The Secrets of Isis, appeared as Isis, and her alter-ego Andrea Thomas, on three episodes of Shazam!, and John Davey likewise appeared as Captain Marvel in three episodes of Isis.
"Shazam!" is a song written by Duane Eddy and Lee Hazlewood and performed by Eddy. The song reached #4 on the UK Singles Chart and #45 on the Billboard Hot 100 in 1960.