Apocalypse Cow
The Simpsons: Season 19, Episode 17
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Bart tries to save a cow from the slaughterhouse; Homer and Marge devise a plan to stop Bart from getting married.
Show: The Simpsons
Episode number: 17
Air date: April 27, 2008
Written by: Jeff Westbrook
Chalkboard gag: "A person's a person, no matter how Ralph"