In Springfield: Homer meets his real father; Lisa battled Rev. Lovejoy over the teaching of creationism in school. Beyond Springfield: Israeli Prime Minister Ariel Sharon suffers a stroke and enters a coma; Hurricane Katrina hits New Orleans. Notable guests: Ricky Gervais, Dennis Rodman, Michael York, Lily Tomlin, Joe Frazier. Season rating: 9.1 million viewers.
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