Question: what is the saddest episode of criminal minds?
Answer: Season 2, Episode 15: "Revelations" ...  Season 3, Episode 8: "Lucky" ...  Season 8, Episode 10: "The Lesson" Season 8, Episode 12: "Zugswang" ...  Season 5, Episode 16: "Mosely Lane" ...  Season 5, Episode 9: "100" Season 10, Episode 21: "Mr. ...  Season 5, Episode 12: "The Uncanny Valley"