Which Star Trek film introduced the alternate timeline known as the Kelvin timeline?

Star Trek (2009) introduced the alternate timeline known as the Kelvin timeline.

The film opens in 2233, when the Romulan vessel Narada emerges from a black hole and attacks the USS Kelvin. This event changes the lives of George Kirk, James Kirk, and other characters, creating a divergent history from the continuity established by earlier Star Trek films and television series.

The timeline is named after the USS Kelvin, the Federation starship commanded by Captain Richard Robau and later defended by George Kirk. The designation became especially useful because the film preserves familiar characters while changing their circumstances and chronology.

Star Trek Into Darkness and Star Trek Beyond continue within this same timeline; they do not create it. The film’s time-travel premise also connects the 2009 production to the earlier franchise without requiring the older stories to be erased or rewritten.