Matthew Gray Gubler is a talented actor with a wide range, but there's one character who's going to follow him for the rest of his life. Gubler played young genius Dr. Spencer Reid in CBS's "Criminal Minds," sticking around for all 15 seasons of the original series. Spencer is a major part of all the best "Criminal Minds" episodes , and he's been a fan favorite since the show's premiere.

When "Criminal Minds: Evolution" brought the show back in 2022, fans were ecstatic about the possibility of seeing Spencer Reid again. Sadly, Gubler didn't come back for the revival series, but there's a pretty straightforward reason why. Gubler has gone through a stunning transformation over the course of his career, and when the original "Criminal Minds" ended, his acting career became busier than ever.

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