There is no time travel. Dr. Dustin Williams is a physicist and worked with NASA and other companies. If time travel worked, he would know.

Dr. Deanna Stevens is a trauma specialist who gave no credence to science fiction such as time travel or flux capacitors.

But when they are drawn to one another by an unknown force and have to face the reality that they're in this alone, they have to rethink their strongly held beliefs and rely on each other in ways neither could imagine.