"Suicide Squad" is the sixteenth episode of the second season of Arrow, and the thirty-ninth episode overall. It aired on March 19, 2014.
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Harley Quinn who was a deranged psychiatrist could be heard in a ARGUS holding cell, a member of Batman's rogue's gallery and a member of the Suicide Squad. This also appears to be the case as the character has the same voice as Harley Quinn from the video game, Injustice: Gods Among Us.