The saga sell is the explanatory opening of the show added with the season 2 episode Another Mother. It was narrated by Lance LeGault. In the subsequent episode All-Americans, it was rerecorded by Deborah Pratt whose narration lasted through the rest of the series. The Saga Sell replaced Sam narrating his past few leaps which was surely becoming tedious after 19 episodes and may have been seen by NBC as an insufficiently concise explanation of the show for new viewers.QL Nut,
what is a "saga cell"? I am completely unfamiliar with that term? (I own the complete series on DVD, btw).
Season 2 Saga Sell
"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 is maintained through brainwave transmissions with Al, the project observer, who appears in the form of a hologram that only Dr. Beckett can see or 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."
Season 3-5 Saga Sell
"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 when wrong, and hoping each time that his next leap would be the leap home."
Saga sells used to be a big part of classic television in its first few decades for people to decide whether the show would interest them.