If you've watched "Arrow" at just about any point in its four seasons, the fact that Malcolm Merlyn (John Barrowman has done some very bad things is no secret. Still, the a promotional image released on Twitter for this week's new episode, "Sins of the Father," states, "The sins of the fathers are revealed," along with an image of Merlyn and his biological daughter, Thea (Willa Holland), in mortal peril as of last week's episode. It's worth noting the text reads "fathers," plural.

"Arrow" airs 8 p.m. Wednesdays on The CW.