Official CW description for "Restoration," the third episode of Arrow Season 4

The CW has released an official description for the third episode of Arrow Season 4, airing on October 21.

The episode is called “Restoration” and here’s how they describe it:

LAUREL TAKES HER SISTER TO NANDA PARBAT — The growing tension between Oliver (Stephen Amell) and Diggle (David Ramsey) puts both their lives at risk when they go after Damien Darhk (guest star Neal McDonough) and a H.I.V.E. deployed meta-human. Meanwhile, Laurel (Katie Cassidy) talks Thea (Willa Holland) into returning to Nanda Parbat to ask her father (John Barrowman) to put Sara (guest star Caity Lotz) into the Lazarus Pit. However, Laurel is surprised when Nyssa (guest star Katrina Law) refuses to do it. Wendey Stanzler directed the episode written by Wendy Mericle & Speed Weed (#403). Original airdate 10/21/2015.