Danny Darko (Jack Gyllenhaal) suffers from mental illness. One night he was summoned inexplicably and sleepwalked, thus escaping a plane crashing on the ceiling of his room, an incredible accident. Since then, his life has changed, and he has frequent hallucinations. He often sees a bunny man named Frank, who tells him that the world will be destroyed in 28 days, 6 hours, 48 minutes and 12 seconds; he gets a book, "The Upanishad of Time Travel", and becomes very curious about the time travel and offline universe mentioned in the book. As the end of the world approaches, Jack's life becomes more and more bizarre, and his new girlfriend and family are also involved. It seems that Jack needs to pay a higher price to realize his wish to save the world.