Jon Arbuckle goes to London to be with Liz, and Garfield and Odie sneak along with him. Meanwhile, a deceased Queen gives everything to her cat, Prince XII (Tim Curry). Her only heir, Lord Dargis (Sir Billy Connolly), becomes jealous and tries to kill him. Garfield and Odie sneaks out to the streets of London. Lord Dargis throws Prince in the river, and he ends up in the sewers. Smithee believes he found him, but it's really Garfield, and Jon finds Odie with Prince, and mistakes him for Garfield. Now, the castle animals must keep Garfield safe and keep him thinking that he's royal to save their lives.