Arrow Season 4 Episode 12: Unchained

A new episode of Arrow, titled "Unchained," airs tonight on The CW.

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.

Check out clips and trailers for the episode in the videos below.

Check out preview images in our gallery at the bottom of the page.

"Unchained" episode of Arrow airs tonight at 8PM on The CW.