Physicists take on a question that sounds like science fiction but runs straight through thermodynamics: does time itself have an expiration date? The film, narrated by Morgan Freeman as part of the Through the Wormhole series, builds its case around entropy and the arrow of time, tracing how a universe that keeps spreading its energy thinner eventually runs out of anything left to change. Stephen Hawking's theory of black hole evaporation sits at the center of the argument, the idea that even the densest objects in the cosmos leak radiation and slowly disappear, taking their gravity with them. Researchers walk through what a maximally decayed universe would actually look like, a cold, dark expanse with no stars, no black holes, and no clocks left to tick. The film also weighs competing endings, from a slow freeze to more violent scenarios, and treats the question less as doom-saying than as a genuine unresolved problem in physics, one where the smartest people working on it still disagree about the timeline and the mechanism.