The CW has revealed the first promo for episode 2.16 of "Arrow" which you can check out in the player below. Titled "Suicide Squad," the episode is described as follows:
"Following Slade’s return and his promise to make good on his threat to destroy Oliver’s loved ones, Oliver focuses all his energy on preparing for battle with his former friend. Sarah tries to help but, fearing for her safety, Oliver pushes her away. Meanwhile, Diggle is recruited by Amanda Waller (guest star Cynthia Addai-Robinson) and A.R.G.U.S. to stop a warlord (guest star Lee Majdoub) he knew from his time in Afghanistan. Always the solider, Diggle agrees to help. However, he’s not prepared when Amanda introduces him to the rest of the team – Deadshot (guest star Michael Rowe), Bronze Tiger (guest star Michael Jai White) and Shrapnel (guest star Sean Maher), all criminals he and Arrow helped put away. Lyla (guest star Audrey Marie Anderson) defends the team and explains the world is a complicated place, but Diggle isn’t sure he agrees. When the mission takes a dangerous turn, Diggle is forced to make a difficult decision."
In addition, The CW has revealed the synopsis for episode 2.17, which will see Jessica De Gouw return as The Huntress. Titled "Birds of Prey," that episode is described as:
"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."
"Suicide Squad" is scheduled to air March 19, with "Birds of Prey set to air the following week on March 26. "Arrow" airs on Wednesdays at 8 P.M. ET/PT on The CW.