"Theorizing that one could time-travel within his own lifetime, Dr. Sam Beckett stepped into the Quantum Leap accelerator...and vanished. He awoke to find himself trapped in the past, facing mirror images that were not his own, and driven by an unknown force to change history for the better. His only guide on this journey is Al, an observer from his own time, who appears in the form of a hologram that only Sam can see and hear. And so Dr. Beckett finds himself leaping from life to life, striving to put right what once went wrong, and hoping each time that his next leap...will be the leap home!"

"When I pitched this idea to Brandon Tartikoff and he told me to explain it to him in twenty seconds so his mother could understand it, I decided not to get into the physical aura aspect of it."

"Theorizing that one could time-travel within his own lifetime, Dr. Sam Beckett stepped into the Quantum Leap accelerator — and vanished. He awoke to find himself trapped in the past, facing mirror images that were not his own, and driven by an unknown force to change history for the better. His only guide on this journey is Al, an observer from his own time, who appears in the form of a hologram that only Sam can see and hear. And so Dr. Beckett finds himself leaping from life to life, striving to put right what once went wrong, and hoping each time that his next leap... will be the leap home."

"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 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."

"It all started when a time-travel experiment I was conducting went...a little ca-ca. In the blink of a cosmic clock, I went from quantum physicist...to Air Force test pilot, which could have been fun — if I knew how to fly. Fortunately, I had help: An observer from the project, named Al. Unfortunately, Al's a hologram. So, all he can lend is moral support. Anyway, here I am — bouncing around time, putting things right which once went wrong. A sort of...time-traveling Lone Ranger, with Al as my Tonto; and I don't even need a mask. Oh, boy..."

"Sabrina Le Beauf - Sondra Tibideaux"

"Erika Alexander - Pam Tucker"

"Raven-Symoné - Olivia Kendall"

"Joseph C. Phillips - Lt. Martin Kendall"

"Geoffrey Owens - Elvin Tibideaux"

"Deon Richmond - Kenny"

"Clarice Taylor - Anna Huxtable"

"Earle Hyman - Russell Huxtable"

"Keshia Knight Pulliam - Rudy Huxtable"

"Tempestt Bledsoe - Vanessa Huxtable"

"Malcolm-Jamal Warner - Theodore "Theo" Huxtable"

"Lisa Bonet - Denise Huxtable Kendall"

"Phylicia Rashad - Clair Huxtable"

"Bill Cosby - Dr. Heathcliff "Cliff" Huxtable"

"Ross Bagley: Nicky Banks"

"Alfonso Ribeiro: Carlton Banks"

"Joseph Marcell: Geoffrey Butler"

"Tatyana M. Ali: Ashley Banks"

"Karyn Parsons: Hilary Banks"

"Daphne Maxwell Reid: Vivian Banks (episodes 68-148)"

"Janet Hubert-Whitten: Vivian Banks (1-67)"

"James Avery: Phillip Banks"

"Will Smith: Will Smith"

"Dirk Benedict — 1st.Lt. Templeton "Face" Peck"

"Dwight Schultz — Captain H.M. "Howling Mad" Murdock"

"Mr. T — Sgt. Bosco "B.A." Baracus"

"George Peppard — Lt.Col. John "Hannibal" Smith"

"Ten years ago a crack commando unit was sent to prison by a military court for a crime they didn't commit. These men promptly escaped from a maximum-security stockade to the Los Angeles underground. Today, still wanted by the government, they survive as soldiers of fortune. If you have a problem... if no one else can help... and if you can find them... maybe you can hire... The A-Team."

"Robert Vaughn — General Hunt Stockwell (For Season 5 only as well)"

"Eddie Velez — Frankie Santana (For Season 5 only)"

"Marla Heasley — Tanya Baker"