1. #2. “Simpsons Roasting On An Open Fire”: Season 1 Yes, Homer’s voice sounds more like Walter Matthau than Homer, and the characters look a little different. But this was the first full-length episode aired, and it still works with its Christmas setting and the debut of Santa’s Little Helper. 3. #5. “Treehouse of Horror VIII” Season 9 Almost all the “Treehouse of Horror” episodes qualify for the list, but this was the best of the best with “The Homega Man” (Homer vs. mutants), “Fly vs. Fly” (a spoof of The Fly with Bart as the bug monster), and “Easy-Bake Coven” with Marge as a green-skinned witch. Classic.