Promo for the Arrow Midseason Finale, What We Leave Behind

Arrow -- "What We Leave Behind" -- Image AR509b_0512b.jpg -- Pictured (L-R): David Ramsey as John Diggle/Spartan, Stephen Amell as Oliver Queen/The Green Arrow and Rick Gonzalez as Rene Ramirez/Wild Dog -- Photo: Jack Rowand/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Promo for the Arrow midseason finale, What We Leave Behind

The CW has released the first promo for Arrow Episode 5.09, the midseason finale for the series, where the team’s traitor is revealed to them! Watch the Arrow midseason finale promo in the player below!

Titled “What We Leave Behind,” the episode is officially described as follows:

“After Prometheus attacks Curtis (Echo Kellum), Oliver (Stephen Amell) realizes Prometheus knows all of Team Arrow’s secret identities and is planning to come for them one by one. Felicity (Emily Bett Rickards) and Detective Malone (guest star Tyler Ritter) discover a clue that links Prometheus to Oliver’s past.”

Antonio Negret directed the episode, which was written by Wendy Mericle & Beth Schwartz. “What We Leave Behind” will air December 7 on The CW.

Arrow stars Stephen Amell as Oliver Queen, David Ramsey as John Diggle, Willa Holland as Thea Queen, Emily Bett Rickards as Felicity Smoak, John Barrowman as Malcom Merlyn, with Paul Blackthorne as Detective Lance. The series is executive produced by Greg Berlanti, Marc Guggenheim, Andrew Kreisberg and Sarah Schechter.

The guest stars for Arrow Season 5 include Josh Segarra as Vigilante, The Walking Dead star Chad L. Coleman in the villain role of Tobias Church, and Joe Dinicol as mystical vigilante Ragman.