The CW has unveiled a batch of stills from the next episode of season 4 of Arrow and in one of them we see Oliver (Stephen Amell) hanging out with The Calculator (Tom Amandes).

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The Calculator will be the new villain that will be introduced in the episode, titled 'Unchained,' and in it seems like Oliver is clueless about the identity and motives of the person he is seen with at the event. Amandes, who plays The Calculator, looks very charming sitting by Oliver in the picture.

The previously released teaser for the episode shows Felicity (Emily Bett Rickards) back in work mode, helping Oliver track down "the new threat" i.e. The Calculator. Also, considering this new threat spreads the virus online, Felicity has to be the woman of the hour.

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The Calculator who is known for his evil technical genius and will use his powers to blackmail Roy Harper (Colton Haynes) on the show. In fact the Calculator will be the reason for Roy's return.

Here's the official synopsis for the episode:

"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."

The episode will air on Feb. 3 on The CW.

Watch the preview:

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Arrow, The cw, Television