As Oliver Queen looks to defeat Prometheus on Arrow, he's going to make some "surprising" alliances that will catch audiences off-guard. All season long, the show has been doing strong work wrapping up the first five years of Oliver's story and tying them into his five years away from his home. In the process, the show has reached new heights and given us one of the darkest and most personal superhero narratives ever on TV. Last week's episode saw Oliver almost reach his breaking point, only for his friends to once again save him from himself. Of course, when the show returns from a hiatus at the end of the month, Oliver will be fighting more than just himself.

The promo and synopsis for the upcoming "Dangerous Liaisons" sees Oliver and his team going to all out war in their hunt for Prometheus, but how will the final confrontation go down? We heard recently that Thea will never be allowed to die, but just about everyone else besides Oliver seems fair game. The finale has been teased as being deeply psychological, so there's really no telling what direction things will go in as the flashbacks and the current story merge into what's sure to be brutal television. We've already seen Oliver make some questionable decisions in his quest to take down Prometheus, but it looks like we've only been given a taste so far.

Executive producer Wendy Mericle spoke with EW about the remainder of the season, and teased the dark corners Oliver would go to in his efforts to rid his city and life of his greatest foe.

“The alliances are going to be very surprising. You’re not going to believe who Oliver is working with to defeat Prometheus. It’s going to be really emotional. It’s going to be all about Oliver’s family, but not the family we’re thinking of right now. It’s going to end in a giant explosion, but not where we think it’s going to end, and the emotional punch is going to be bigger than the actual physical part of the bombs going off.”

Sara Lance teams up with slade and Oliver in Arrow

It's hard to imagine exactly who Mericle could be referring to, but one leading candidate is Slade Wilson. A little while back, Arrow star Stephen Amell teased the return of Deathstroke, and there's a good chance he'll be who Oliver teams up with. Considering the man killed his mother, it would be pretty shocking to see them join forces. But Oliver is desperate, and the two were once allies. The possibility of seeing Deathstroke again is exciting regardless, but the idea that Oliver might free him from prison in order to take down Prometheus would make for one exhilarting finale.

Lending credence to this theory is the fact that the finale won't take place in Star City. Considering Oliver is heading back to Lian Yu in the flashbacks, it would be fitting for him to do the same in the present day. Whether it's his choice in order to team up with Slade, or the island is where Prometheus is heading following last week's episode, tying everything back to where it all began and Oliver and Slade's past friendship would be a fitting way to wrap up the stellar fifth season of the show.

Arrow returns Wednesday, April 26 with “Dangerous Liaisons,” at 8 pm on The CW.

Source: EW