The CW has released the official episode description of Katrina’s February 5 episode of Arrow.
ALEX KINGSTON AND KATRINA LAW (“SPARTACUS”) GUEST STAR — As Laurel (Katie Cassidy) continues to unravel, Oliver (Stephen Amell) and Lance (Paul Blackthorne) 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. Wendey Stanzler directed the episode written by Jake Coburn (#213).