The Silent Guardians!
Former occupant of Guthrie Mansion, the Mad Thinker was arrested 13 years ago and incarcerated at the Bros. Grimm Day Care Center.
The Mad Thinker is a roboticist, a real wizard when it comes to inventing robots. He sent five robots—“dreadnoughts”—to attack Kingdom Falls, and was successful in that mission. His next attack involved a Giant Robot Monster that The Silent Guardians were able to defeat.