Executive Producer Wendy Mericle previews tonight's "Brotherhood" episode of Arrow.
"Thea is still grappling with her bloodlust and Malcolm Merlyn is going to return to Star City to try to help her," Mericle says. "Malcolm has a very disturbing solution that Thea really doesn't want to pursue."
She then goes on to say that we'll learn new and shocking truths about Andy Diggle.
Check out the sneak peek in the video below
Team Green Arrow’s ongoing battle with Damien Darhk (Neal McDonough) is complicated by a shocking revelation. Thea’s (Willa Holland) bloodlust returns and she loses control in front of Alex (guest star Parker Young).
Arrow stunt and fight coordinator James Bamford directed the episode written by Speed Weed and Keto Shimizu.
"Brotherhood" episode of Arrow will air tonight at 8 p.m. ET/PT on The CW.