Morgred

Morgred is a character in the twenty-seventh Goosebumps book A Night in Terror Tower, and its accompanying television adaptation.

History
Centuries ago, Morgred was the personal sorcerer of the royal family in the kingdom of Britannia. After the king's brother usurped the throne, he had his niece and nephew, Susannah and Edward locked in a room atop Terror Tower, with the intention of executing the two of them. Before they were to be executed by The Lord High Executioner, Morgred cast a spell to have Edward and Susannah travel in time, as well as erase their memories. However, The Lord High Executioner managed to find a way to travel through time to find Sue and Eddie, intending on finishing his job. As Sue and Eddie dealt with the executioner, they managed to travel back to medieval times, only to wind up captured once more.

After reuniting with Morgred, he tries to cast the spell once more, but it no longer works. Sue and Eddie try to run, but Morgred freezes them in place as the executioner arrives. But before the executioner can finish the kids off, Eddie uses the magic stones he stole from the executioner to return back to the present. As the kids are about to leave the tower, they're greeted by Morgred, who traveled to the present with them. He changes his name to "Mr. Morgan" and becomes Sue and Eddie's surrogate father.