Emily Bett Rickards will guest star as Felicity Smoak on The Flash's October 28 episode, The CW revealed this afternoon.
That information caused the network to release an updated synopsis of the episode, titled "Going Rogue," which will feature Captain Cold (played by guest star Wentworth Miller), to account for Felicity's appearance.
Prior to the start of The Flash, of course, Barry Allen appeared on Arrow and had a brief flirtation with Felicity Smoak. The relationship has been referenced on both series, as Felicity used to visit comatose Barry in the hospital.
You can check out the updated synopsis below.
“Going Rogue” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)
WENTWORTH MILLER GUEST STARS AS DC COMICS’ VILLAIN CAPTAIN COLD; FELICITY FROM “ARROW” CROSSES OVER INTO CENTRAL CITY — The Flash (Grant Gustin) stops a robbery but the culprits get away after shooting a guard, and The Flash chooses to save the man instead of following the criminals. Joe (Jesse L. Martin) shows Barry a book of suspects and Barry identifies Leonard Snart (guest star Wentworth Miller, “Prison Break”) as the leader of the group. While investigating the case, Barry gets a surprise visit from an old friend – Felicity Smoak (Emily Bett Rickards, “Arrow”), who heard about his new abilities and came to check them out for herself. She joins him at S.T.A.R. Labs to help stop Snart after it’s revealed that Snart his gotten his hands on a stolen “cold gun,” which could kill The Flash. Dr. Wells (Tom Cavanagh) is furious when he finds out that Cisco (Carlos Valdes) built the cold gun without telling anyone and now it’s missing. Meanwhile, Iris (Candice Patton) is getting the silent treatment from Joe because of her relationship with Eddie (Rick Cosnett). Finally, The Flash and Captain Cold have an epic confrontation. Glen Winter directed the episode written by Goff Johns & Kai Yu Wu (#104). Original airdate 10/28/2014.