A secret agent known as Agent X has shown up in the neighbourhood and is stealing Garfield’s limelight by telling anybody who wants to listen all about his adventures. Nermal, Arlene and Harry quickly succumb to his charms, but Garfield is suspicious. Is he really a spy? Garfield is determined to find out the truth, and with the help of his mouse friend Squeek, he soon realizes that Agent X isn’t all he appears to be…