When Mayor Quimby and the Springfield City Hall brass ban all liquor from the town, Moe's Tavern becomes a speakeasy. But procuring booze proves extremely difficult, especially when Rex Banner, a straight-laced government prohibition agent, comes to town. It's up to Homer to start his own bootlegging operation to wet the whistles of Springfield's liquor-loving masses. Dubbing himself the Beer Baron, Homer manufactures all forms of alcohol in the basement of his house, nearly getting caught by Banner at every turn. When Banner finally does catch Homer, Chief Wiggum intervenes and the prohibition agent is sent packing. When an elderly City Hall clerk re-reads the town charter, the prohibition is repealed and the people of Springfield rejoice by getting smashed.