13x12 - The Simpsons

While running away from a vicious dog, Bart meets Buck McCoy, a former Western film star. Bart begins hanging out with him and starts to idolize him. Bart wants to help McCoy stage a comeback, so he convinces all of the kids in town to become interested in the Wild West. McCoy appears on the Krusty the Clown Show, but the comeback flops when Buck begins drinking again and injures Krusty the Clown.