The Mephistopheles reference article from the English Wikipedia on 24-Apr-2004
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Mephistopheles

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Mephistopheles ("he who loves not the light"), also Mephisto, Mephistophilus, and Mephist, is a name given to one of the chief demons in Western religious traditions. The name is frequently used as an alternative form of Satan or the Devil. However, as the name Mephistopheles evolved during the Renaissance, Mephistopheles makes no appearance in the Bible. Rather, Mephistopheles appears in various literary works which tell the tale of the legendary Faustus, a man who sells his soul to the Devil. One notable reference to this fable is found in the commencement of Bertrand Russell's celebrated essay "A free man's worship", which has as a central theme a callous, omnipotent creator, who creates man for his play.

The mad scientist in the South Park TV series is called Dr. Mephisto.