The CW has debuted the extended promo for episode 2.17 of "Arrow" which you can check out in the player below. Titled "Birds of Prey," the episode is described as follows:
"When Frank Bertinelli (guest star Jeffrey Nordling) is arrested, Oliver knows it’s only a matter of time before his daughter, Helena, AKA The Huntress (guest star Jessica De Gouw), returns to town. To make matters worse, Laurel is picked to try Frank’s case, putting her right in the path of Helena. Oliver tells Sara he will handle his ex-girlfriend, but when Helena takes hostages at the courthouse, including Laurel, the Canary will stop at nothing to save her sister. When The Huntress and Canary meet, an epic battle begins. Meanwhile, Roy realizes he needs to keep Thea safe, but doesn’t like the way he is forced to go about it."
Directed by John Behring and written by Mark Bemesderfer & A.C. Bradley, "Birds of Prey" will air on March 26. "Arrow" airs Wednesdays at 8 P.M. ET/PT on The CW.