C. H. Greenblatt (born June 17, 1972) is an American cartoon writer and storyboard artist. He has worked on the hit TV series SpongeBob SquarePants, and on the Cartoon Network's series The Grim Adventures of Billy & Mandy and Evil Con Carne. In November 2007, Greenblatt began Chowder, an animated show that he created and executive produced for Cartoon Network. Greenblatt collaborated with Maxwell Atoms on his new Billy & Mandy spin-off Halloween special called Underfist. Greenblatt reprised his role as Fred Fredburger in the collaboration. He also performed as a storyboard artist for The SpongeBob Squarepants Movie in 2004.
- Carl - SpongeBob Squarepants in the season 4 episode, "Selling Out".
- Fred Fredburger - The Grim Adventures of Billy & Mandy, Underfist
- Kimchi, Kiwi, Future Chowder, Himself, Additional voices - Chowder
- Buckaww - Quads!