If you loved the Challenge of the SuperFriends with the Legion of Doom, this is the episode for you.
When a construction crew recovers the Hall of Doom, Batman and Robin wonder how the workers obtained top secret information. That crew is really the Legion of Doom, and they capture the duo. They then go to the Hall of Justice to take over and turn Superman and Wonder Woman into crystal. Luthor and company start a crime wave, but the heroes manage to escape and stop the Legion before robbing Fort Knox.