Theorizing that one could time travel within his own lifetime, Dr. Sam Beckett led an elite group of scientists into the desert to develop a top-secret project known as Quantum Leap. Pressured to prove his theories or lose funding, Dr. Beckett prematurely stepped into the project accelerator, and vanished.
He awoke to find himself in the past, suffering from partial amnesia and facing a mirror image that was not his own. Fortunately, contact with his own time was maintained through brain-wave transmissions with Al, the project observer, who appears in the form of a hologram, that only Dr. Beckett can see and hear. Trapped in the past, Dr. Beckett finds himself leaping from life to life, putting things right that once went wrong, and hoping each time that his next leap will be the leap home.