When decorated soldier Captain Colter Stevens wakes up in the body of an unknown man, he discovers he's part of a mission to find the bomber of a Chicago commuter train.
Hoping to alter the events of the past, a 19th century inventor instead travels 800,000 years into the future, where he finds mankind divided into two warring races.
When a rare phenomenon gives police officer John Sullivan the chance to speak to his father, 30 years in the past, he takes the opportunity to prevent his dad's tragic death. After his actions inadvertently give rise to a series of brutal murders he and his father must find a way to fix the consequences of altering time.