Dr. Dana Jones has invented a device, with which she is able to look into the past. The device is based on the scientific hypothesis, coined by John Wheeler in 1940, that all electrons and positrons are actually a manifestation of a single entity, which is able to travel back and forth through time. She and her team want to discover, why humans have left earth more than 25000 years ago. Little do they know that what they are about to uncover has changed the course of humanity forever.