The Janitor

Glen Matthews, more commonly known as the Janitor, was the unproductive custodian and handyman at Sacred Heart Hospital until he left and was never heard from again. He rarely actually performed the duties of his job, but rather spent his time plotting how to annoy J.D., on whom he performed many pranks. He is an avid liar and nearly every story or anecdote he tells people is a fabrication. He also lead the Brain Trust group and seemed to be the leader of the custodial staff.
Janitor is married to "Lady" Williams, but for a long time was infatuated by "Blonde Doctor" Elliot Reid. He competed with Dr. Cox at times, but his biggest competition was from Dr. Kelso who often bothered him about not doing his job. He is afraid of Carla, but occasionally will prank Turk.
Janitor is portrayed by Neil Flynn and has appeared in 166 episodes of Scrubs as a main character for seven seasons. He first appeared in "My First Day" and was last seen in "Our First Day of School" in a flashback where he simply walked out of the hospital after learning J.D. was never returning to Sacred Heart.