Homer realizes that he hasn't done his taxes for the year, and rushes to get it finished, making up information. He is arrested for tax fraud and is ordered to go undercover for the FBI. He is enlisted to help recover a trillion dollar bill that Mr. Burns was supposed to deliver to Europe after the war, but never arrived.
Homer makes it into Burns' home and persuades him to show him the bill. The FBI immediately enter and arrest Burns, but his speech about government taxation makes Homer believe that the FBI are in the wrong.
Homer snatches Burns and along with Smithers, they flee the country and arrive in Cuba. They are tricked into handing over the trillion dollars to Cuba, and Burns vows to bribe the jury when he is brought to trial.