1x17 - Black Scorpion

When Argyle is accused of car jacking, his ex-partner Luther Simms, a.k.a. the Gangster Prankster, breaks him out of jail and forces him to join his gang. Gangster Prankster, sick of being the butt of jokes, escapes jail and forces Argyle to invent a weapon to punish anyone in City of Angels who laughs.