"The Justice League Recombination" is the eleventh episode of the fourth season of the American sitcom The Big Bang Theory. This episode first aired on Thursday, December 16, 2010.
Plot[]
The guys get Zack and Penny to join the guys' DC Comic Justice League of America costume group for a New Year's Eve bash at the comic book store to win the best group costume prize. Penny is going as Wonder Woman, while Zack dresses as Superman.