Arrow: Season 5, Episode 23

5 - 23: Lian Yu

The battle between Oliver and Adrian Chase culminates in a final epic battle on Lian Yu. After recent events, Oliver decides to recruit a group of unlikely allies - Slade, Nyssa, Merlyn and Digger Harkness - to defeat Chase. However, Chase has his own army - Black Siren, Evelyn Sharp and Talia al Ghul - and the forces collide in an explosive season finale.