The third season finale introduced flash forwards to the show. ("Through the Looking Glass")

A flash-forward (or prolepsis, also sometimes known as a flash-ahead) in a narrative occurs when the primary sequence of events in a story is interrupted by the interjection of a scene representing an event expected, projected, or imagined to occur at a later time. The flash-forward technique is used less frequently than its reverse, the flashback, or the flash-sideways.

In Lost, the flash-forward technique was introduced in "Through the Looking Glass", although it wasn't made clear that it was a flash-forward until the end of the episode. The first episode to feature a flash-forward that was clearly shown to be one from the start was "The Beginning of the End". "Ji Yeon" was the first episode to intertwine flashbacks with flash-forwards, although the flashback element was only clearly revealed to be in the past at the end of the episode, making its temporality a plot twist.

List of flash-forwards[]

See also[]