The CW has released an official description for the fourth episode of Arrow Season 3, which airs on October 29.
It’s called “The Magician” and features the return of Katrina Law as Nyssa. We also meet Ra’s al Ghul! Here’s the write-up:
NYSSA RETURNS TO STARLING CITY, RA’S AL GHUL MAKES HIS ENTRANCE — A furious Nyssa (guest star Katrina Law) confronts Oliver (Stephen Amell) about Sara. When Oliver learns Malcolm Merlyn (John Barrowman) is alive, he suspects Merlyn killed Sara. Oliver and Nyssa join forces and go after the Dark Archer, intent on bringing Sara’s killer to justice. Laurel (Katie Cassidy) keeps her distance from Nyssa, as she blames her sister’s death on her involvement with the League of Assassins. Meanwhile, Oliver and Roy (Colton Haynes) work on repairing their respective relationships with Thea (Willa Holland), who has returned home. Nyssa discusses Oliver with her father, Ra’s al Ghul (guest star Matt Nable). John Behring directed the episode written by Wendy Mericle & Marc Guggenheim (#304). Original airdate 10/29/2014.