Forty-eight survivors of a plane crash are stranded on a creepy island. Do it wrong, and it's Gilligan's Island redux. Do it right, and you've got last season's most engrossing series, which demands a repeat viewing to digest its ever-twisting storyline.
Extras: Rollicking commentaries and documentaries yield juicy behind-the-scenes info, but alas, no new clues about Lost's big mysteries.
THE COSBY SHOW: SEASON 1 (4 discs, $49.99)
Twenty-one years after Bill Cosby's groundbreaking sitcom began its eight-year run on NBC, the laughter generated by the adventures of the Huxtables—a prospering black family—is still contagious.
Extras: A sugary retrospective special that aired on NBC in 2002.