The TV series Lost produced 121 episodes across six seasons.
Lost premiered in 2004 and concluded in 2010, using flashbacks, flash-forwards, and later time shifts to tell the survivors’ stories. The episode total includes the two-part premiere and finale as separately counted broadcast episodes in standard episode listings.
The show’s structure changed over time. Early seasons focused heavily on the crash survivors’ lives and the island’s mysteries, while later seasons expanded the mythology involving the Dharma Initiative, time travel, and the island’s guardianship. Despite those shifts, the full run remained an ensemble drama rather than a conventional weekly procedural.
Episode counts can vary in casual references because some broadcasters combine two-part stories into one longer presentation. The commonly cited total for the series is 121 episodes, making it important to use a complete episode list rather than count only season titles or finale events.