John Barrowman talked about what fans can expect from the rest of season 4 of Arrow in a recent interview with TVLine.

Malcolm Merlyn Will Be 'Messing Up' Oliver's Plans

One of the highlights of the interview was Barrowman teasing a major plot twist, courtesy Nyssa al Ghul (Katrina Law). When asked about his character Malcolm Merlyn aka the new Ra's al Ghul's dynamic with Nyssa, Barrowman revealed it would be a bumpy ride, following it up with the big tease.

"All I will say to that is it's going to take a twist and a turn," he said. "Obviously, Malcolm was involved with the death of her father, so she has a bit of a grudge and she's very vocal about it. But she does something that is one of the episode's jaw-dropping moments, where people are going be like, "Ohhhh.... Myyyy.... God."

Death In Premiere Is Not 'A Fake-Out,' Showrunner Dishes

The actor also spoke about how Malcolm is taking to being the new keeper of the dark side as Ra's al Ghul. Barrowman stated that the upcoming episode of Arrow will assure Ra's al Ghul of his power, and control on his kingdom, including Nyssa.

"It's complicated but it's good, because where we left him, he had the League kneeling at his feet, Nyssa included," he said. "Six to seven months have passed, so you do don't know whether he's in control or not, but something happens [this week] where you realize that these fighters, these men and women, are under his control."

The upcoming episode of Arrow, titled 'Restoration', will air on Oct. 21.

Here's the official synopsis:

"The growing tension between Oliver (Stephen Amell) and Diggle (David Ramsey) puts both their lives at risk when they go after Damien Darhk (guest star Neal McDonough) and a H.I.V.E. deployed meta-human. Meanwhile, Laurel (Katie Cassidy) talks Thea (Willa Holland) into returning to Nanda Parbat to ask her father (John Barrowman) to put Sara (guest star Caity Lotz) into the Lazarus Pit. However, Laurel is surprised when Nyssa (guest star Katrina Law) refuses to do it. Wendey Stanzler directed the episode written by Wendy Mericle & Speed Weed (#403)."

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Arrow, The cw, Television