Nothing much is known about Dr. Slicer's past. He graduated from an unknown university with 'A major in discipline with a minor in punishment,' and 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 scar during a prank that involved electromagnets. When Principal Prickly of Third Street School accepts a job as the new principal of a middle school, Dr. Slicer is hired to replace him.