Ra's al Ghul will make his Arrow debut on October 29, when the character appears in the season's third episode, titled "The Magician," The CW has revealed.
Things start to really ramp up in the episode, in which Oliver learns that Malcolm Merlyn is still alive and he, along with Ra's al Ghul's daughter Nyssa, sets out to find Merlyn, assuming he's responsible for Sara's murder.
Thea also returns home this week, presumably changed by the experience and certainly ready to guilt-trip Roy and Oliver.
“The Magician” — (8:00-9:00 p.m. ET) (TV-14, LV) (HDTV)
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.
Arrow returns next Wednesday, October 15, at 8 p.m. ET/PT on The CW.