In addition to the two main endings, of which there are two versions, depending on whether you attacked Lavos with the Epoch or not, there are also ten additional endings, most of them light and goofy, that can be accessed by the bucket in the End of Time or Lucca's Telepod, at various points during the game. However, since Lavos is incredibly hard, you should only attempt this with the New Game+ option, after you have beaten the game.