Arrow Season 2 episode 15 spoilers ahead! If you have not caught up with the latest episode of the show, then I suggest holding off on reading this article but if you have caught up, then read on as the next episode of Arrow is going to be a good one!

In the final moments of the last episode, Oliver came to head with Slade, who was in the middle of a meeting with Moira. As the story unfolds it becomes clear that Oliver cannot do things on his own and he will need all the help he can get against his old friend and teacher.

The official synopsis for Arrow Season 2 Episode 15: "The Promise":

"THE TURNING POINT - Oliver (Stephen Amell) is shocked when he learns that Slade (Manu Bennett) has come to Starling City. Back on the island, as Oliver, Slade and Sara (Caity Lotz) prepare to take over the freighter from Ivo (guest star Dylan Neal), Sara pulls Oliver aside and tells him he needs to kill Ivo to prevent him from telling Slade what happened with Shado. Oliver feels immense guilt over the situation but realizes Slade's growing rage from the Mirakuru makes him unpredictable and he could turn on his friends if he thinks Oliver is to blame. Oliver agrees to kill Ivo and the battle begins. Glen Winter directed the episode written by Jake Coburn & Ben Sokolowski (#215)."

Executive producer Marc Guggenheim in the Arrow Season 2 Episode 15 preview said that the new episode is "the biggest episode we've ever done on the show," as it will feature "two iconic moments in the life of our series": Oliver putting on the hood and Slade the Deathstroke mask, each for the first time.