The past came back to haunt Oliver in the mid-season finale of Arrow. “What We Leave Behind” finally revealed who Prometheus is and brought back a beloved character.

In the previous episode we learned that Evelyn is working with Prometheus. In this episode we learn that she has been giving Prometheus intel not only on Oliver but the entire team. Evelyn brings Prometheus Oliver’s notebook (the one with his kill list back from when he was The Hood) and tells Prometheus she wants to be there when he kills Oliver; she wants to watch him die. Prometheus tells Evelyn he doesn’t wish to kill Oliver but he will uproot his life so much that he is going to wish he was dead. And boy did he live up to that promise in this episode.

After Felicity awkwardly introduced Billy as her boyfriend to Curtis and Oliver at the Mayor’s Christmas party, things really turned sour. Curtis gets into an argument with his husband Paul and then gets into a fist fight with Prometheus. He is seriously injured but his cover is blown. Not only does Prometheus know who he is but his husband now knows he is a vigilante and has been lying to him about it this whole time.

While he was being attacked by Prometheus Curtis was injected with Dycloserol. A man off Oliver’s list named Justin Claybourne, introduced the drug 4 years ago when Oliver was The Hood. Oliver went after this man and killed him when he would not lower the cost of the drug in order to save the community he purposely injected with tuberculosis. Oliver thinking Claybourne is Prometheus, heads back to the warehouse where he created the serum. There he ran into a trap from Prometheus. Wilddog and Evelyn are called to come to Oliver’s rescue and that is when Evelyn turns on them.

Evelyn helps Prometheus escape and Oliver informs the team of her betrayal. Rory warns Curtis about Evelyn and Paul overhears their phone call. Curtis finally comes clean and tells Paul he is working with The Green Arrow. Paul is then forced to give Curtis an ultimatum. Either he quits being a vigilante or their marriage is over. Unfortunately for Paul, Curtis has never felt more like himself then when he his Mr. Terrific. He can’t give up being a vigilante.

Billy, who doesn’t heed Felicity’s warning, goes off in search of evidence to bring in Prometheus. He can’t stop hunting the cop killer because it is who he is. Unfortunately for Billy, he is caught snooping around by Prometheus but not before he could send a picture of a baby to Felicity.

Prometheus takes Billy hostage and the SCPD is forced to go after him, this time with a shoot to kill order.

While Oliver and the team (with the help of Speedy, who seems to be coming out of retirement a lot) go out in search of Billy, Felicity runs the baby picture through facial recognition software. Turns out the baby and Prometheus are one in the same; they are the illegitimate son of Justin Claybourne. Prometheus is seeking vengeance for the murder of his father. Oliver finally puts the pieces of the puzzle together and goes back to the place where he murdered Prometheus’s father.

He arrives at the scene of the crime and discovers Prometheus is staging bodies exactly how Oliver left them 4 years earlier. The only difference is that Prometheus now stands in his father’s place. A battle begins and Prometheus leads Oliver into a room with mirrors. Oliver fires arrows into Prometheus’s chest only to realize he actually shot Billy. Prometheus pulled a play out of The Joker’s handbook and dressed Billy up in his suit and taped a weapon in his hand. Oliver had no way of knowing that it was Billy and reacted out of pure instinct. He returns to the arrowcave and tells Felicity that he accidently killed Billy. Felicity blames Prometheus and forgives Oliver, at least for now.

Oliver then tells the team that Prometheus said anyone Oliver goes near dies and that they should all get as far away from him as possible. The team refuses to leave his side.

At the close of the episode John gets a frantic call from Lyla and heads to their location only to be greeted by the feds. He was set up and is on his way back to prison.

After the team leaves Oliver is left alone in the arrowcave momentarily. As he nears the glass tubes where the suits are kept he is greeted by none other than Laurel Lance. How the hell is she still alive?!?!?!

Arrow returns Wednesday January 25^th, 2017.

To come on this season of Arrow:

Curtis will realize his full potential and the team will attempt another difficult Diggle prison escape.

Clip from the new episode coming Wednesday January 25^th:

For those that have the CW app (if you don’t download it, it’s free!), The CW has given app users an exclusive look into the next episode of Arrow which airs on Wednesday January 25^th:  Oliver is on a mission to find the Russian woman who trained both him and Prometheus. The team is slowly easing Laurel back into reality and filling her in on what she missed. Oliver gets Diggle a lawyer after he decides to fight his wrongful conviction.

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