Justice League Unlimited - 206 - "Double Date"
Huntress is kicked out of the Justice League for attempting to murder mob boss Steven Mandragora, the man responsible for her parents' death. She recruits the Question to assist her in finishing him off while Green Arrow and Black Canary attempt to thwart their efforts. This episode was originally intended as a Birds of Prey tribute (hence the selection of Gail Simone as writer), but evolved away from the original concept as the episode developed.