The CW has debuted the first promo for episode 2.13 of "Arrow" which you can check out in the player below. Titled "Heir to the Demon," the episode is described as follows:
"As Laurel continues to unravel, Oliver and Lance try to convince Sara (guest star Caity Lotz) to stay in Starling City and finally reunite with Laurel and Dinah (guest star Alex Kingston). However, Sara’s fellow League of Assassins member, Nyssa (guest star Katrina Law, "Spartacus"), comes to bring Sara back to the fold, but when Sara refuses, Nyssa kidnaps Dinah. Realizing she's putting her family in danger by staying in town, Sara considers re-joining the league."
Directed by Wendey Stanzler and written by Jake Coburn, "Heir to the Demon" will air on Wednesday, February 5. "Arrow" airs on Wednesdays at 8 P.M. ET/PT on The CW.