Mastermind (Scooby-Doo! Night of 100 Frights)

The Mastermind is the monster behind all of the other monsters that Mystery Inc. faced in Scooby-Doo! Night of 100 Frights. However, he was beaten by Scooby-Doo and was revealed to be Holly Graham. He is voiced by Tim Curry.

Mastermind is very smart, as he has created holographic images of various monsters that Mystery Inc. had unmasked in the past, including the Headless Specter and the Green Ghost. He also has the ability to fly and teleport.