Dr. Alexander (Guy Pearce) is an avid science enthusiast who has always wanted to prove that time travel is feasible and has devoted all his energy to the research of time machines. But one day, the unexpected death of his fiancee made him angry and indignant, and he stepped up the development of the time machine, hoping to return to the past and save his fiancee's life. The time machine was successfully developed, and Alexander successfully traveled to the past and witnessed his fiancee's accident. But no matter how many times he went back to the past, there was no way to save his fiancee, who would die from various accidents. The problem, where is it? In order to solve this mystery, Alexander put his hope of finding answers in the past. Keep crossing, keep going to the future to find answers... Until the earth 800,000 years later, Alexander discovered that humans have evolved to be completely different from now. At that time, the earth was divided into two factions, the peace-loving Eli and the warlike Moruo. In order to help the Eli get rid of the rule of the Moruo, Alexander did not hesitate to destroy the time machine, and he also discovered the final secret.