Unthinkable

"Unthinkable" is the upcoming twenty-third and final episode of the second season of Arrow, and the forty-sixth episode overall. It will air on May 14, 2014.

Synopsis
Slade moves forward with his plan to kill one more person in Oliver's 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 takes on Amanda Waller with a little help from some friends, and Thea turns to Roy in her time of need.

Production
Preparation ran from March 28 until April 7, 2014. Shooting began on April 8 and ran until April 17, 2014.