Glee's original script featured a crystal meth-addicted Mr. Schue
Co-creator Ryan Murphy says Glee was originally pitched as a "NC-17 version of show choir"

While Glee is not necessarily a bright spot in the history of television, it turns out it could have been much darker. Series co-creator Ryan Murphy recently appeared as a guest on Glee stars Kevin McHale and Jenna Ushkowitz’s podcast That’s What You REALLY Missed, divulging some new details about the origin of the candy-coated pop musical show.
It all started when someone approached Murphy at the gym, instantly pegging him as a show choir fan.
“We were having these conversations and I was trying to figure it out,” Murphy said (per Insider). “Like serendipity, I went to the gym and I was in a towel and a guy went up and handed me a script and he said, ‘I had a feeling you were in show choir, am I right?’ And I was like ‘Yeah.’ And he said, ‘My friend wrote this script and you should read it.’”
“Mr. Schue, I believe, was a crystal meth addict in Ian’s script,” Murphy continues. “The NC-17 version of show choir with a weird protagonist who was unraveling.”A more fitting name would have been Gloom.