The episode begins with Professor Farnsworth showing the gang his three-dimensional family tree. He points out all the important and influential relatives. When Leela asks about Fry, the professor points out a branch that is dead and covered in dung beetles. The branch falls onto the actual Fry, who wakes up from a nap.
Fry then says that he has to go to his night job. He tells Leela that he works two jobs to afford the money for coffee to stay awake for his night job. At his second job, Fry is a security guard at the Head Museum. His boss warns him that he better not do anything wrong, including have a party. He goes on to feed the heads of presidents. The president heads try to get Fry to throw a party at the museum. He initially declines, but they soon convince him.
Fry invites the whole gang. The professor then shows the presidents his family tree.George Washington becomes enrages, saying that David Farnsworth was “a stain on American history.” He tells the professor that David Farnsworth was one of the worst traitors of the revolution. He was a British spy as well as a counterfeiter. Fry’s boss then returns, but instead of getting mad, she parties with the crew. When Dr. Zoidberg drinks some of President Lyndon Johnson’s “jar-juice,” there is a big flash and Zoidberg, the professor, and Amy are all transported to the 1960’s for a brief moment. They quickly return and tell everybody what happened. Fry then licks Herbert Hoover’s head. Fry, Hermes, and Lela are then transported back to the 1920’s.
Fry’s boss explains that they do not know how the juic works, but that its main ingredient is “crystalline opal.” Professor Farnsworth states that he has discovered “a new means of time travel.” The professor then pours a bunch of the crystalline opal into Washington’s jar and licks it in an attempt to stop David Farnsworth from ever turning on the U.S. and aiding the British in the American Revolution. The professor, Fry, Lela, and Bender are then transported back to 1775.
The gang goes to a meeting between the founding fathers. The men inform the professor him that only Ben Franklin has a printing press capable of printing the counterfeit. They go to Philadelphia. They soon discover that David Farnsworth is Franklin’s apprentice, but he is currently in Boston. They get to Boston quickly by tying a kite with a key to Benders head during a storm. When lightning strikes, Bender is supercharged and quickly pull the carriage behind him. When they arrive in Boston they meet up with Alexander Hamilton, who points them in the direction of Farnsworth.
When they find him, they burn all of the counterfeit money with a lantern that Fry took from the Old North Church tower, where Paul Revere hung the lanterns to warn that the British were coming. The “crystalline opal” then wears off, sending the gang back to the future. However, when they arrive, they all have heavy British accents and clothes. Also, they are not in the Hall of Presidents, they are in the Hall of Nobility.
The gang returns to the office, where Hermes shows them a history video explaining what happened during the revolution. The confusion with Revere caused the Americans to quickly lose. David Farnsworth then killed Washington by smothering him with his wig. After the revolution, Farnsworth was named a Duke, so now the professor is an aristocrat with lots of money and property.
When the gang asks him to go back and change things, he says he does not want to go back, because then he would not be rich. The ugly queen arrives, expecting Farnsworth to have sex with her, just as they always have. The professor finds more opal in the queen’s crown. They put it into David Farnsworth’s head jar and return everything to normal, though some of the presidents are now different people.