Samurai Jack: Season 1, Episode 12

1 - 12: Jack and the Gangsters

Samurai Jack gets an offer to join a Thirties style gang of mobsters at the Blue Monkey club and decides to take them up on it so he can get close to Aku. The gang plans to steal something Aku has been unable to obtain: the legendary Neptune Jewel, guarded by Earth, Wind and Fire.