Quantum Leap is an American science fiction television series that ran for 96 episodes from March 1989 to May 1993 on the NBC network.

The plot involved scientist Sam Beckett (Scott Bakula) leaping to various points in time, usually constrained within the period of his own lifetime.

The show overlaps a number of genres, including science fiction, family drama, comedy, social commentary, and nostalgia, and won a broad range of fans. Protagonist Sam Beckett occasionally has minor encounters with celebrities such as Buddy Holly and Michael Jackson as youths, often helping to inspire their eventual fame. These are examples of a type of predestination paradox.

One of the series' most popular elements was that at the end of every episode Sam would leap into the next person, giving viewers a teaser of the following episode's installment. As part of a running gag, Sam would leap, and in awe or dismay about his new surroundings / circumstances would utter the catch phrase "Oh boy!"

Doctor Sam Beckett led a group of top scientists into the desert to research his theory that a man could time travel within his own lifetime. Unfortunately, in order to save his funding, he was forced to enter the accelerator prematurely and vanished. He then found himself in someone else's body with partial amnesia. His only contact from home is Al, a holographic image only he can see and hear. Setting right things which once went wrong, Sam leaps from life to life, hoping each time that this is the final leap home. Written by Kevin

Although the project isn't ready yet, Sam hops into the Accelerator and leaps. As Tom Stratton, an Air Force test pilot, Sam finds his memory Swiss cheesed, with only enough left to know that he is not where or when he belongs. Al explains that the project has gone "a little ca-ca" and that the only way Sam can leap out is by flying the X-2 to Mach 3. Instead, Sam leaps after saving Tom's life, wife and child, only to find that rather than leaping home, he's leapt into Tim Fox, a minor league baseball player in Texas, at the end of the 1968 season, where he must make the winning play in order to leap. Written by Sam Beckett

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 brainwave transmissions with Al, the project observer, who appeared 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 would be the leap home." courtesy of: http://www.quantumleap-alsplace.com/#premise Written by Anonymous