The World's Finest Supervillain Hideout
- Episode aired May 4, 2015
Lex Luthor introduces the Joker to his new additions to the gang and the Legion of Doom is created.Lex Luthor introduces the Joker to his new additions to the gang and the Legion of Doom is created.Lex Luthor introduces the Joker to his new additions to the gang and the Legion of Doom is created.