The synopsis for episode 12 of season 4 of Arrow reveals that Roy Harper (Colton Haynes) is set to return.

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

The brief for the episode, "Untitled," announces Harper and Nyssa's (Katrina Law) comeback in Star City and also reveals that a new villain will be coming to create havoc.

Here's the official synopsis:

Showrunner Teases 'Real Game-Changer' In Upcoming Episode Of Arrow

"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."

Previously, 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!"

The midseason premiere, "Blood Debts," will air on January 20 on The CW.

Watch the teaser:

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Arrow, The cw, Television