Now that the secret identity of Prometheus is out, The CW has released a description with spoilers for the March 22 episode of Arrow, which is called “Kapiushon.” Here’s the write-up:
THE BREAKING POINT — Prometheus (Josh Segarra) goes to great lengths to break Oliver (Stephen Amell). Meanwhile, in the flashbacks, Anatoly (guest star David Nykl) becomes worried about Oliver’s increasingly violent tendencies, which come to a head in a brutal confrontation. Kevin Tancharoen directed the episode written by Brian Ford Sullivan & Emilio Ortega Aldrich (#517). Original airdate 3/22/2017.