Lord Dargis traps Prince in a picnic basket and throws him into the river.
Garfield inadvertently switches places with Prince: Jon finds Prince climbing out of a drain and takes him to the hotel, while Prince's butler Smithee finds Garfield in the street and takes him to Carlyle Castle.
In the grand estate Garfield is residing in, he receives the royal treatment, including a butler and a team of four-legged servants and followers.
Garfield teaches his animal friends how to make lasagna, while Prince learns to adapt to a more humble setting, while in Jon's company.
Lord Dargis sees Garfield and thinks Prince has come back - if the lawyers see Prince/Garfield they will not sign the estate over to Dargis, who secretly wants to destroy the barnyand and kill the animals to build a country spa.