Seasons 3 and 4 of The Simpsons.
So, that's 4 seasons down, and only 16 more to go until I have every season set in my extensive library of dvds. You know, I actually remember the very first time that The Simpsons aired on television 20+ years ago. I was in fifth grade and the Simpsons' Christmas Special was playing on the Fox Network. Who'd have thought that this show would run for as long as it has? I wonder if the Simpsons can make it for another decade. I think that they can, unless, that is, one of the core cast members dies or retires.