S7 E10: Super Friends Season 7 Episode 10
Batman and Robin foil some building constructors' plans to revive the Hall of Doom, which was destroyed in a previous encounter with the Super Friends, and turn it into a Museum. When Batman figures something is wrong, the building constructors reveal themselves to be Lex Luthor, Soloman Grundy, Sinestro and the rest of the Legion of Doom. The Legion of Doom proceed with their salvage operation, restoring the Hall of Doom to its initial deadly condition. When the Legion of Doom attacks Metropolis, Superman and Wonder Woman attempt to stop them only to get crystallized by Lex Luthor's Crystallization Ray. With the Super Friends defeated, the Legion of Doom take over the Hall of Justice to make their demands. Meanwhile Superman and Wonder Woman are able to move again thanks to Superman's X-Ray vision and are off to stop the Legion of Doom. Batman & Robin must find a way to reverse the polarity of Luthor's Crystallization Ray to transform Superman and Wonder Woman back to normal so the Legion of Doom's raid on Fort Knox can be put to an end.
