Alexander Hartdegen (Guy Pearce) is a scientist and a inventor, who is determined to prove that time travel is possible. When the girl he loves is tragically killed, Alexander is determined to go back in time and change the path. Testing his theories, the time machine is hurtled 800,000 years into the future. He he discovers a terrifying new world. Instead of mankind being the hunter, they are now the hunted, with him stuck in the middle.