This was a segment on the "Kid Super Power Hour with Shazam!". Billy was given great powers by Shazam, an old super being who had to find a new defender. Whenever Billy yells "Shazam!", he is transformed into Captain Marvel. Mary and close friend Fred Freeman were also given the powers by Shazam. Mary exclaims "Shazam!" just lie Billy, but Fred exclaims the name of his hero, "Captain Marvel!". Together, the three heroes fight to protect the innocent and those who can't defend themselves. They fight all sorts of evil villains and monsters.