Malcolm in the Middle

Malcolm in the Middle
Season 3, Episode 22
Monkey
Image #132

"Myocardium, the muscle tissue of the heart."

heart muscle tissue

TMDB episode metadata

Episode title: Monkey

Air date: May 12, 2002

Director: Ken Kwapis

Top billed cast: Frankie Muniz, Jane Kaczmarek, Bryan Cranston, Justin Berfield, Erik Per Sullivan, Christopher Masterson

New monkey business occupies Reese, now a self-appointed law enforcer; a capuchin monkey has it in for Lois's co-worker, Craig.

Source: TMDB