The Big Bang Theory‘s unaired pilot isn’t as infamous as the original first episode of Game of Thrones, but everyone involved sounds relieved that it never aired on TV.

The pilot “didn’t work for a bunch of reasons,” co-creator Bill Prady told Entertainment Weekly in a respective for the CBS sitcom, which premiered 15 years ago this month. “In the first pilot, the female character [who, at that point, was named Katie] is kind of rough. She’s dangerous in a way and wasn’t very nice to the guys.”