The Source of All Evil is a fictional character on the WB television series Charmed, a demon who is the ruler of the underworld for the show's first 4 seasons. He is portrayed by Michael Bailey Smith, Bennet Guillory and Peter Woodward over the course of the series and had a brief resurrection in one episode during the show's eighth season.

He was responsible for incarcerating the powerful demon Zankou and The Tall Man. He is also responsible for banishing numerous beings from the underworld, such as: The vampires, wizards, Kurzon and even possibly, Hecate.

His first on screen appearance is in the episode "All Hell Breaks Loose", but his lurking backroom presence was a regular theme in the backplot creation of many prior episodes during the show's first four seasons—especially so in seasons three and four—- where he occurred regularly in exposition dialog as "a name" behind or of having sent or being connected with other evil entities mentioned. He is depicted very differently in appearance than in the later episodes (picture above, and right), having an appearance in early depictions of an unseen face-in-the-shadows in a heavily cowled dark colored robe, the first being a robe of blood-red velvet, the next few appearances, just ones in less exotic materials colored black.

Source may refer to: