In the first episode of Justice League Unlimited's fourth season, the Black Canary enlists the aid of The Green Arrow in her efforts to save her mentor, Wildcat, from a potentially grisly fate. For reasons known only to himself, Wildcat has agreed to participate in a "meta brawl" in a super-powered underground fight club known as The House. Making matters worse, a wall of near-impenetrable secrecy has been built around The House. ~ Rovi