Watch the trailer below for the mid-season finale of Arrow, "What We Leave Behind."
Episode synopsis:
PROMETHEOUS MAKES A DEADLY MOVE AGAINST OLIVER AND THE TEAM — 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 written by Wendy Mericle & Beth Schwartz (#509). Original airdate 12/7/2016.
Arrow airs Wednesdays at 8pm ET on The CW starring Stephen Amell.
