Katrina Law is set to reprise her role as Nyssa Al Ghul this season on Arrow. She will be back in episode 616 titled "The Thanatos Guild," slated to air in March.
Here's a statement from exec producers Wendy Mericle and Marc Guggenheim:
In an unforgettable episode that will change ‘Arrow’ forever, Katrina Law returns as the Daughter of the Demon, Nyssa Al Ghul.
Nyssa comes to Star City to warn of an impending danger that will threaten everything we know and love.
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