Malcolm in the Middle - Season 7 Episode 9

When Malcolm's arch nemesis and former teacher, Mr. Herkabe, crosses the line and hurts Reese's feelings too many times, he decides to pay him back for hurting his brother by revealing his former teacher's awful secret. He had flunked gym and lied about it. Because of that truth, the Principal decides to strip him of his trophy and hand it back to the one who passed gym, despite her blindness. Meanwhile, Hal gives Dewey a ton of wrong advices to a girl he likes.