Arrow: "Unthinkable" - Season Finale Preview Photos Released: Suicide Squad Returns!

The Suicide Squad will return -- and rebel against A.R.G.U.S. and Amanda Waller to help John Diggle and Lyla Michaels save Starling City, the new photos from Arrow's Season Two finale reveal. And that's just the tip of the iceberg. Twenty-five new images reveal the nature of the episode's big shocdown, including who will fight whom, who will be taken hostage by Deathstroke and, seemingly, whether or not Malcolm Merlyn survived his encounter with his daughter at the end of last night's episode. Of course, if you've been paying attention to Stephen Amell's Facebook and Twitter feeds, you might have seen how a couple of these storylines play out...and there are far more spoilers here than there have been in recent production stills, so beware if you're not into that kind of thing. OLIVER MUST DECIDE ONCE AND FOR ALL IF HE'S A KILLER OR A HERO — Slade (Manu Bennett) moves forward with his plan to kill one more person in Oliver's (Stephen Amell) life. While Oliver has fought all year to be more than the killer he once was, when Slade kidnaps someone close to Oliver's heart, Oliver is pushed to the edge and realizes sometimes it takes doing the unthinkable to stop the monster. Meanwhile, Diggle (David Ramsey) takes on Amanda Waller (guest star Cynthia Addai-Robinson) with a little help from some friends, and Thea (Willa Holland) turns to Roy (Colton Haynes) in her time of need. John Behring directed the episode with story by Greg Berlanti and teleplay by Marc Guggenheim & Andrew Kreisberg (#223). Check out the gallery below.