“Arrow” will air its Season 2 finale on Wednesday (May 14), and it promises to be a big one. Find out what action and drama are in store for “Unthinkable” in the newest promo and in a clip from the episode.

As an added bonus, there’s a quick glimpse at “The Flash” as well. More of that spinoff show will be on display when The CW airs its full “Flash” promo during the “Arrow” finale episode.

The CW has also released a brief but informative clip from “Unthinkable.” In it, Team Arrow (plus Lyla and a de-mirakurued Roy) find the Foundry lair pretty much destroyed. Slade’s army has already been there.

Three interesting points are made in this clip. 1. The mirakuru cure works well enough to return Roy to sanity. 2. Lyla and Diggle are embarking on a dangerous mission with no small amount of potential doom. 3. Oliver really, really doesn’t want to kill people.

Will he be able to keep to that resolve? The answer will come in the “Arrow” Season 2 finale, “Unthinkable,” airing Wednesday, May 14 at 8 p.m. ET/PT on The CW.

Posted by:Laurel Brown