Professor Celluloid is an Albert-Einstein esque character created by Film Brain and played by lordhebe. His name is a direct reference to celluloid film. While he does share some traits with Dr. Insano, he's nowhere near as manaical. In fact, he usually just serves as the comic relief in Film Brain's show. However, he has, on occasion, desired to do the reviews themselves.
His appearance is somewhat odd. He primarily wears glasses with fake eyes, and his hair is a bright orange afro. Other than that, his clothes can vary from episode to episode.