User blog comment:Tommy,Klaus&Kol2012+/Will Mephistopheles appear on Supernatural?/@comment-3481504-20120710015213

Um no, they're the one in the same. Take Ghost Rider for example, Mephisto, or Mephistopheles as you call him, is the Devil, a Fallen Angel. Point being, they're the same character and the fact is Lucifer already appeared.