Professor Jantzen

Professor Jantzen was an actor hired by Vincent Van Ghoul to play the role from his movie Castle of Runny Discharge. Van Ghoul was trying to start a reality show in which he scared his dinner guests, and Shaggy and Scooby were his first "victims."

Appearances

 * Scooby-Doo! Mystery Incorporated - Nightfright

Trivia

 * The movie title seems to be a parody of Castle of Blood.