Colton Haynes revealed that he is comeing back for this season of Arrow via Twitter.

Haynes, who guest stars as Roy Harper on the show, expressed excitement about being back in Vancouver to begin filming for his parts in the show.

In other news of guest stars returning in the rest of the season, Nyssa al Ghul (Katrina Law) hasn't quite left the building yet.

John Barrowman Teases 'Jaw-Dropping' Twist Spurred By Nyssa

Fans were left wondering if Nyssa will be coming back this season after she was put behind bars. Arrow showrunner Wendy Mericle confirmed to TVLine that Nyssa will indeed be coming back as she has unsettled business.

"Nyssa's stories are far from wrapped up," said Mericle. "She's in Nanda Parbat, she's been arrested in the wake of destroying the Lazarus Pit, and she has a score to settle with Malcolm Merlyn. We don't intended to leave anyone hanging, including her!"

So Merlyn (John Barrowman) should brace himself as his troubles on the Nyssa feud front are not quite over yet.

In a previous interview with TVLine, Mericle had spoken some more about Merlyn's character arc when it comes to Nyssa.

Nyssa will not be at peace about Merlyn claiming what was assumed to be her birth right, playing heiress to Ra's al Ghul. According to Mericle, Nyssa is "definitely not going to be on board with Malcolm as Ra's." This animus will lead to some fighting: "We're hoping to take that in a cool, very fighty-fight orientated direction."

The next episode, titled 'Legends of Yesterday,' will air on Dec. 11 on The CW.

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Arrow, The cw, Television