Not every actor plays a character for 15 years, but Matthew Gray Gubler lived in Dr. Spencer Reid's skin for as many seasons. He started on CBS' "Criminal Minds" when he was just 25 years old and is the only cast member to have appeared in every episode.
Between the fan adoration and his enduring presence, the young genius Spencer — who's always got a scientific explanation or obscure fact on the tip of his tongue — has become synonymous with the series.
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