The teaser for the next episode of season 4 of Arrow, titled 'Unchained,' was recently unveiled and it introduces a new threat.

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In the clip Felicity (Emily Bett Rickards) is seen back in work mode, helping Oliver (Stephen Amell) 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.

Tom Amandes is set to play the villain 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.

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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."

In other recent news, a TVLine spoiler report has revealed that Nyssa al-Ghul (Katrina Law) will be on the warpath against Malcolm Merlyn (John Barrowman) in this episode.

The report reveals that Nyssa is set to return in 'Unchained' and that she might even be enlisting Oliver to take Malcolm down. The show's executive producer Wendy Mericle dished about what lies ahead in this regard. She revealed that Nyssa "is going to take on Malcolm in a really ambitious and full-scale way, and she's going to be asking Oliver to do some pretty dark things."

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

Watch the preview:

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Arrow, The cw, Television