Terrance (a spy from the MI5) is looking for a Russian spy who is known as "The Grey Fox". He learns that The Grey Fox is in a town in America with a nuclear power plant. He goes to Springfield and starts to think that Grampa Simpson is the Russian spy. Terrance talks to Grampa's son Homer about what he thinks of Grampa. Homer wants to help Terrance with finding the spy. They go to a beach and find Grampa taking a cane. Grampa is given an envelope from two men who look like Russians. Terrance later kidnaps Homer and Grampa. Chief Wiggum follows Terrance's car with Marge and arrests him. Grampa makes Terrance feel better by pretending to be The Grey Fox.