According to IMDb, the highest-rated episode of Criminal Minds is episode 11 of season 11, “Entropy,” which currently holds a 9.2 average rating out of 10 on the site. Notably, it was the first episode to feature Aubrey Plaza of Parks & Recreation as Cat Adams, aka the Black Widow Killer, a role she ended up reprising in four episodes.
“Entropy” puts Cat at the center of its plot, as a majority of its runtime is dedicated to a tense restaurant stand-off between her and Spencer Reid (Matthew Gray Gubler). The two engage in an unpredictable mind game throughout the episode, and while it ends with Reid ultimately outsmarting Cat, the final moments allow Cat to hit Reid with one last bittersweet jab. Plaza and Gubler make the most of their screentime together, and the confrontation remains one of the show’s most memorable plotlines.
With such an electrifying turn from its guest star, it’s not hard to see why “Entropy” ranks so high with fans of Criminal Minds.