caught its last UnSub this past February when the CBS series exited after 15 seasons. September 22 marks 15 years since its 2005 premiere, and for the first time, fans are facing a TV season without the BAU.

So, disappointed viewers, how about this? We’ve rounded up 10 trivia tidbits about the procedural and its cast. You likely know about ’s , ’s , and the  surrounding  and ’s ousters.

But do you know which 

 star was originally booked for just one episode? Which cast members played near-identical roles on ? And why Reid wore glasses all the time? Read on…

1.  was originally called  and was  less than two months before CBS announced its 2005–06 primetime lineup.

2.  (Penelope Garcia) was only slated to appear in one Season 1 episode but ended up staying for the entire run. In , Vangsness credited her longevity to her chemistry with costar 

, saying their characters had the “yummiest, delicious, coolest male/female relationship.”

3. The Season 4 episode “Memoriam” features Moore’s character, Morgan, watching , the CBS soap opera on which he starred for more than a decade.

4. Spencer Reid wore glasses on the show only because actor  was allergic to contact lens solution.

“Half the people think they’re great and the other half think they’re the ugliest they’ve ever seen and say, ‘You look like a nerd.’” Gubler told the  in 2006. “I think they fit the character. Someone described it as a 1960s accountant look.”

5.  inspired a South Korean adaptation, also called  (크리미널 마인드). Cast member Lee Joon-gi won the (adorably titled) Fabulous Award at the 2017 Asia Artist Awards for his role on that series.

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