The Mighty Heroes was an animated television series created by Ralph Bakshi for the Terrytoons company. The original show debuted on CBS, on October 29, 1966, and ran for 1 season for 21 episodes.
The series is set in Good Haven, a city that is continually beset by various supervillains. When trouble occurs, the city launches a massive fireworks display to summon a quintet of high-flying superheroes into action.