Purgatory

"Purgatory" is the seventh episode of the eighth and final season, and 167th episode overall of the American television series Arrow based on the DC Comics character Green Arrow, revolving around billionaire playboy Oliver Queen as he returns to Starling City (later renamed Star City), after having been shipwrecked for five years, and becomes a bow-wielding, hooded vigilante who sets out to fight crime and corruption. It is set in the Arrowverse, sharing continuity with the other television series of the universe. The episode is written by Rebecca and Rebecca Rosenberg. Hughes and directed by James Bamford. Plot The team learns that Lian Yu, the island Oliver Queen was stranded on, has been giving off an immense amount of strange energy and Lyla Michals tasks William Clayton with creating a device to harness it, while the plutonium is being transported by Dinah, Rene and Roy Harper. Upon arrival, their plane is shot down by a missile and crash lands on the island. Diggle, Lyla, and Connor rescue Dinah and Rene, while Oliver and Laurel retrieve the plutonium. However, they are confronted by Edward Fyers, Billy Wintergreen and Yao Fei – deceased figures from Oliver's past who were all revived by the island's supernatural energy. Meanwhile, Diggle's party finds Roy, whose right arm is pinned; forcing Connor to amputate it, after William completes the weapon, Lyla activates it and transforms; absorbing the island's energy and causing its revived inhabitants to disappear before entering a portal. She later returns, now calling herself a "harbinger of things to come", and informs Oliver and Mia Queen that the Crisis has begun as the sky turns red.