What is the title of Lost season 3’s two-part finale?

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Lost season 3’s two-part finale is titled “Through the Looking Glass.”

The episode aired in the United States on May 23, 2007, and was written by Damon Lindelof and Carlton Cuse. Its title refers to Lewis Carroll’s sequel to Alice’s Adventures in Wonderland, continuing Lost’s frequent use of literary and symbolic references.

“Through the Looking Glass” is structured around events on the island and flashbacks concerning Jack Shephard. The finale includes the survivors’ attempt to contact a freighter and the destruction of the underwater station known as the Looking Glass.

Its closing scene is especially notable because it initially appears to be a flashback but is revealed to be a flash-forward. That reveal changed how viewers understood Jack’s future and became one of the show’s major turning points.

Source: Wikipedia · fact-checked Sept. 2026

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