Lost debuted on ABC in September of 2004 and ran for six seasons, a total of 121 episodes. It was the largest ensemble starring cast ever assembled for a TV show, and is one of the most expensive ever produced. Luckily, it was also hugely successful, breaking into tough-to-win-over demographic groups and garnering almost universally positive reviews. Its ethnically, economically, and physically diverse cast was and still is unique for a primetime television show and, I think, one of the best parts of the show. It's finale polarized viewers and critics alike and is still seen by many as one of the worst ever aired. I disagree, and will get to that later.