WATCH: Nyssa Escapes Ra's al Ghul's Prison in <i>Exclusive</i> "Arrow" Clip

Roy Harper's (Colton Haynes) not the only person from Oliver Queen's past set to return to "Arrow" tonight, as Nyssa al Ghul takes her first step in taking on the man who succeeded her father as the head of the League of Assassins.

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In a CBR-exclusive clip from "Unchained," Nyssa (guest star Katrina Law) discovers that some members of the League remain loyal to her, helping her escape the prison where the current Ra's al Ghul -- better known as Malcolm Merlyn -- has been holding her captive.

Starring Stephen Amell and Emily Bett Rickards and David Ramsey, "Arrow" airs Wednesdays at 8 pm EST on The CW.

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