: On Lian Yu, the flashbacks conclude with Oliver, Slade Wilson, and Shado successfully stopping Fyers from shooting down a commercial airliner, though the victory is bittersweet as they remain stranded.

: Malcolm Merlyn (initially presumed dead after being stabbed by Oliver) and Tommy Merlyn.

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: The episode's destruction of the Glades and Tommy’s death set the darker tone for Season 2 and fundamentally shifted Oliver’s mission from "vengeance" to "heroism".

: Earlier in the episode, Moira Queen holds a televised press conference where she confesses her involvement in the Undertaking and exposes Malcolm Merlyn's plan to the city. Key Highlights

" Sacrifice " is the high-stakes Season 1 finale of Arrow , delivering a tragic and game-changing conclusion to the show's debut year. The episode focuses on Oliver Queen’s desperate attempt to stop Malcolm Merlyn’s "Undertaking," a plan to level the Glades using a man-made earthquake.