It's been nearly 30 years since Dr. Sam Beckett stepped into the Quantum Leap accelerator and vanished. Now, a new team, led by physicist Ben Seong, has been assembled to restart the project in hope of understanding the mysteries behind the machine and the man who created it. Everything changes, however, when Ben makes an unauthorized leap into the past, leaving the team behind to solve the mystery of why he did it. At Ben's side throughout his leaps is Addison, who appears in the form of a hologram only Ben can see and hear. She's a decorated Army veteran who brings level-headed precision to her job. As Ben leaps from life to life, putting right what once went wrong, it becomes clear that he and the team are on a thrilling journey. But they also know that if they are going to solve the mystery of Ben's leap and bring him home, they must act fast or lose him forever.