The Mighty Heroes
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.