The actor, who left the series in 2020, came back to play his beloved character Dr. Spencer Reid in Season 18, Episode 3, ...

Matthew Gray Gubler’s Dr. Spencer Reid. Fans of the OG series know that Gubler’s character — a genius BAU agent introduced on Day 1 of the show — starred in 15 seasons and over 300 episodes.

One of the most significant losses in the show’s history was that of boy-wonder Dr. Reid Spencer, played by Matthew Gray Gubler. During the fifteen-year original run of Criminal Minds ...