Arrow — “Unchained” — Image AR412A_0156b.jpg — Pictured (L-R): Katie Cassidy as Black Canary, Stephen Amell as Green Arrow and David Ramsey as John Diggle — Photo: Liane Hentscher/ The CW — © 2016 The CW Network, LLC. All Rights Reserved.

Executive producer Wendy Mericle previews tonight’s episode of ‘Arrow,’ titled “Unchained.”

http://www.youtube.com/watch?v=bCUKUck_PvU

Official Synopsis:

ROY HARPER RETURNS; NYSSA MAKES HER MOVE — The team faces off against a formidable villain nicknamed The Calculator (guest star Tom Amandes). Meanwhile, Nyssa (guest star Katrina Law) makes her move and Roy Harper (guest star Colton Haynes) returns to Star City. Kevin Fair directed the episode written by Speed Weed & Beth Schwartz (#412).  Original airdate 2/3/2016.