WATCH: New "Arrow" Promo Promises Oliver vs. Ra's al Ghul

On tonight's episode of "Arrow," Nyssa al Ghul staged her escape and Thea was dealt a possible death sentence. The convergence of Thea's illness and Nyssa's attempt to reclaim her place as Heir to the Demon, set Oliver on a war path against Malcolm Merlyn. In a duel much like the one he fought in Nanda Parbat, Oliver must again defeat Ra's al Ghul, as his sister's life hangs in the balance.

Check out the new trailer for "Sins of the Father" below:

ARROW"Sins of the Father" - (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

NYSSA MAKES OLIVER AN OFFER - Oliver (Stephen Amell) receives an offer from Nyssa (guest star Katrina Law) that is hard to refuse. Meanwhile, Thea (Willa Holland) continues to battle the blood lust, Malcolm (John Barrowman) steps in to help his daughter, and Laurel (Katie Cassidy) has a heart to heart talk with Nyssa. Gordon Verheul directed the episode written by Ben Sokolowski & Keto Shimizu (#413). Original airdate 2/10/2016.

Starring Stephen Amell, Neal McDonough, David Ramsey and Emily Bett Rickards, "Arrow" airs on The CW on Wednesdays at 8/7C.

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