Hogwarts he is detected using magic in the presence of Muggles, a serious offence among the wizarding community. Dumbledore argued in Harry's defence, stating that it was done in self-defence, and that the Ministry has no authority to expel students – such powers are invested in the Headmaster and the Board of Governors. Snape has attempted to have Harry expelled, and he attempted to have Harry's father, James Potter, expelled when they were at Hogwarts together. The only student known to have been expelled is Hagrid, for the murder of Myrtle with an acromantula believed to be the Monster of Slytherin
The Demon Headmaster bring order and control to the world, under his leadership of course. Not much else is revealed about him or the origin of his power. His name is never mentioned, as he is always referred to by various titles, such as The Headmaster and The Computer Director, though it's known that he does "have" a name - in fact a central plot point of The Demon Headmaster Takes Over is finding it. In 1996, the Demon Headmaster books were adapted by the BBC to make a television series based on the books. The series proved popular with the children of