Some "joker" named Mastermind discovered the secret identities of the Justice League (he probably just looked for chronic winkers). He then detailed his plan to destroy Earth hoping that the Leaguers would let him do it fearing their identities being compromised. Instead, the League divided up and stopped all the attacks he had described. Superman was captured, but Hawkman was able to lead his rescue using his newly revealed "radar vision." Then Superman threw an asteroid at Mastermind, apparently killing him... not that he didn't deserve it. All in a day's work.
Episode Count: 0161
Series Count: (3 of 3)