Jon, Garfield, and Odie arrive in a historical American village. Jon had written to them beforehand to say he was coming. He came because he discovered he had a family history dating back to the Revolution. They then spot an angry mob trying to run them out of town. At first, Jon stupidly mistakes them for a welcoming committee, but then gets the idea and runs. They duck into an alley, and a man pushes a door open and ushers them inside. When they are inside, they are greeted by the librarian, Mr. Marian, who bears an extraordinary resemblence to Benjamin Franklin. He explains to Jon why the villagers want to run him out of town. Jon has a family history dating back to the Revolution, all right- his ancestor was the feared pirate, Long Jon Arbuckle! Mr. Marian shows Jon a portrait of his ancestor, who was a traitor to America, then shows him a case containing his hat, his gun, and his cat's dish, above which hangs Long Jon's sword. Garfield then reads to Odie an entry from Long Jon's diary, which tells how he and his crew ruthlessly plundered the American warship "Endeavor", and relieved the crew of their belongings, (Including a fresh supply of clams, one of which squirted water in Long Jon's cat's face) including some maps written by George Washington, knowing full well how vital they were to the American cause. Odie then drools on a seemingly blank page. Jon and Mr. Marian start shouting at him, but then realize that his drool is making invisible ink appear! Odie turns and slurps the rest of the blank pages, while Garfield comments "Who would've believed it? A practical use for Odie kisses!" Jon reads the formerly hidden entry. It reveals that General Washington had sworn Long Jon to secrecy about the maps taken from the "Endeavor", hence the usage of invisible ink. Long Jon plundered and captured the endeavor merely to confirm the General's suspicions that the ship had already been captured by the British. This made the maps, as Long Jon already knew, fake. The capture of the British soldiers was kept secret so Long Jon could continue to spy for Washington. He did present Long Jon with a letter of commendation, however, which the pirate entrusted to his cat to hide. The cat then reached for a clam (as the letter was presumably recieved at a celebratory dinner), which squirted water in his face. Back to reality, the angry mob finds Jon in the library, and chases him around, while Jon tries futilely to explain that Long Jon was a spy for Washington. Mr. Marian backs him up, while Garfield and Odie look for the letter. Garfield said to Odie "If that cat was anything like my ancestors, I'll bet I know where he hid the letter; A cat's most prized possession is his supper dish." Mr. Marian is trying to explain to the mob, when Garfield hands him the dish, upside-down. Marian then realizes that ship's dishes are weighted so they don't slide on the deck, and this one has a false bottom! He unscrews the false bottom and finds the letter! Later on, Jon, Garfield, and Odie are at a restaurant. The waiter serves them a large platter of clams, and apologizes on behalf of the angry mob. Jon comments to Garfield and Odie that they had changed history. Garfield reaches for a clam, which squirts water in his face. Garfield then says "I don't know about history, but some things never change."