Season 04, Episode 13 – “Praimfaya”
In the Season 4 finale, it’s a race against the end of the world as Praimfaya arrives, forcing the heroes to make impossible decisions to ensure their survival.
Season 05, Episode 23 – “Lian Yu”
The battle between Oliver and Adrian Chase culminates in a final epic battle on Lian Yu, as Season 5 ends. Oliver recruits a group of unlikely allies, Slade, Nyssa, Merlyn and Digger Harkness, to defeat Chase. However, Chase has his own army that includes Black Siren, Evelyn Sharp and Talia al Ghul.
Season 02, Episode 17 – “Sympathy for the Goddess”
When the man who had the final piece of the Flaming Sword is murdered and the piece goes missing, Mom joins Chloe and Lucifer on the case to track down the killer. But when Lucifer gets sidelined, Maze recruits him to help save Dr. Linda’s endangered career and confronts him about the secrets he’s been keeping.
Season 03, Episode 23 – “Article 5”
Elizabeth heads to Brussels to seek NATO’s support against Russia when it threatens to invade Bulgaria, but when France refuses to cooperate, it could threaten the alliance’s very existence. Also, Henry’s new government role has him dive into the Russia issue and turn to his former operative, Dmitri Petrov, for help; and as Nadine and Mike B’s relationship heats up, Elizabeth finds out information about her old friend that makes her question his loyalties on the third-season finale.