Dr. Filbert is a gay friend of Zack's that appeared in the episode The Real Book Club. He is extremely short in height.


When choosing teammates for their gay dodgeball team, Zack chose Dr. Filbert for his team. He overlooked his height and overall inadequacy for playing dodgeball and chose him because he owed him a lot of money. Dr. Filbert pelted Kenny with a dodgeball, despite him being on the same team as him. Later in the episode, it was mentioned that the dodgeball game had to stop early because Dr. Filbert got a nosebleed that wouldn't stop.