The first full trailer for Arrow’s 2017 return answered a big question about the winter cliffhanger, but Prometheus’ identity will continue to haunt us as Season 5 wears on. That’s no more evident than in the first photos and synopsis for January premiere “Who Are You,” as Felicity may steer Oliver toward revenge against the masked villain.

The CW released both a full photo set and synopsis from the January 25 return episode, in which Oliver finds himself distracted from Prometheus and his killing streak by Laurel’s apparent return. Of course, Laurel isn’t the only one out for some apparent payback, as the synopsis for “Who Are You?” teases Felicity’s need for vengeance after Billy Malone’s death:

OLIVER WANTS JUSTICE; FELICITY WANTS REVENGE

Worried that Prometheus is right and he is truly a killer at heart, Oliver (Stephen Amell) looks for any ray of hope and finds it in what seems to be the miraculous return of Laurel Lance (guest star Katie Cassidy).

However, Felicity (Emily Bett Rickards), still reeling from Detective Malone’s murder, is bent on revenge – she wants to stop Prometheus at any cost. While in prison, Diggle (David Ramsey) fights for his life.

Time will tell when Season 5 introduces us to the newest of Prometheus’ accomplices, but will the latter half of Arrow Season 5 prove so taut as its first? Where’s Russia, or Kovar in all of this? Watch the trailer below.

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