Dr. Slicer is a rather strict and militant teacher. He only appears in the episode "Prickly is Leaving." However, in his one appearance, he has gained a reputation for being rather disproportionately ruthless and cruel. He is addressed as a Doctor. Dr. Slicer is a minor antagonist. Nothing much is known about Dr. Slicer's past. It is stated that he graduated from an unknown university with "a Ph.D in discipline with a minor in punishment.' Moreover, he may have been in the military at some point considering his demeanor. He dislikes pranksters, or "funny boys," because according to him one gave him a scar during a prank that involved electromagnets. When Principal Prickly accepts a job as the principal of a middle school, Dr. Slicer is hired to replace him at Third Street. He is said to resemble Heinrich Himmler, this much is obvious when one looks at his photograph. He is bald, has glasses, has a thin mustache, and wears a suit with an overcoat.
Friends: Miss Finster, Principal Prickly, Miss Grotke, TJ Detweiler, Vince LaSSao, Ashley Spinelli, Gretchen Grundler, Mikey Blumberg, Gus Griswald, Randall Weems and Menlo
Enemies: Earwin Lawson, Gelman, Conrad Mundy, Greg Skeens, Sue Bob Murphy, Lazy Kid, Chucko Kowalski, Jocko, Buster, Cheay, Koreo and Kurst the Worst
Likes: Punishments, rules, discipline, behaving children and dealing with troublemakers (particularly Lawson)
Dislikes: Troublemakers, pranksters, sappiness, misbehaving children, students getting him arrested, being fooled and being pranked by troublemakers