SpongeBob SquarePants Season 6 Episode 8 Pest of the West ( Air Date 2008-04-11 ) Genre Animation, Comedy, Family category. Overview "While researching his family tree, SpongeBob finds that he is a distant relative of SpongeBuck, a sheriff from Bikini Bottom's past who helped save the citizens from the quickest whip draw in town, the evil Dead Eye Plankton.".