Forum:Unused Levels and Bossess In Majora's Mask

Hello, I'm new here, and for my first post I wanted to ask a question. I had a friend who once told me that there were two other dungeons complete with bossess that didn't make it to the final version of Majora's Mask. He also said that Majora had a few other forms as well. Does anyone else know anything about this, ,if it's true?