I moved the Clone High timeline a few years up so the theme song is still accurate and the clones were born in the 1980s, but that it would also work with the timeline of Scrubs. Clone High now takes place in 1998, and it would help if you were familiar with the episode "Litter Kills: Litterally."
Glenn Matthews wasn't always the crazy Janitor at Sacred Heart. He was once happy and had a normal life in a town called Exclamation, USA. There he was a cheerful high school janitor that everyone liked, and the proud foster father of Ponce de Leon, a teenage clone of the original.
Glenn loved Ponce as if he were his own, and never referred to him as a foster son. Deep down, he blamed himself for what happened, really. He was the janitor, after all. He didn't think much of the littering, because kids would be kids, but why couldn't he keep things cleaner? He couldn't clean up the litter on campus fast enough, and it cost him his son.
Things were different after that. He had always known that the principal of Clone High had had a screw loose, but he didn't know he could be so cold. He made him clean the school during his own son's funeral, and then fired him when the students decided to pitch in and help clean the litter before someone else died. And maybe he deserved to be fired - if only he had kept the school clean in the first place. He couldn't shake the feeling.
So he packed up and moved to another nondescript town and became a hospital janitor. He couldn't take lives here - in fact, he liked to think that he was helping out to save lives, just a little bit. He liked working at Sacred Heart well enough, but it was almost as if he was invisible. He wasn't as well liked as he had been in Exclamation, and he was lonely. Sometimes he wondered what he was doing it all for.
Then that's when he walked through the door. A young intern named John Dorian, who acknowledged him. They made small talk about the door the janitor was trying to repair, when the intern mentioned that a penny could be stuck in he door.
A penny? How is that even a suggestion? Unless... Glenn made sure that young JD would know what happened to him if he found a penny. He was of course just kidding, but JD looked so scared. The intern rushed off as The Janitor continued to work on the door.
And when he found the penny, he decided to mess with the intern - it was all friendly. But when JD acted as if The Janitor was crazy, Glenn decided a crazy janitor he could be - crazy is better than invisible.
Once in awhile, he would share details from his life that were 98% fabricated. Some of that childhood stuff was true, and he really was in The Fugitive, but the truth was they would never believe him if he told them about his real life in Exclamation, anyway, and since they thought he was crazy, he may as well have fun. And he did. For the first time since he lost his son to litter, Glenn had purpose in his life. He picked up a hobby, even if some people thought taxidermy was a little creepy. He even managed to fall in love and get married to a lovely lady named Lady.
But then JD left, and again The Janitor didn't know what to do with himself. So he quit. He never picked up another mop again.
Being a janitor only ends in heartache. Maybe he could go back to acting.