In a recent interview, former "Simpsons" show runner Al Jean called Kelsey Grammer his favorite guest star, and it's easy to see why. In 2005, Grammer even won an Emmy for his work as Sideshow Bob, a criminal psychopath with a genius IQ and refined manner of speaking. In one of his more memorable appearances, Season 5's "Cape Feare" (seen here), Bob is paroled from prison and hunts down the Simpson clan, who have been relocated to Terror Lake as part of the Witness Protection Program.
The Best 'Simpsons' Guest Stars
From regulars like Kelsey Grammer to one-offs like Winona Ryder, stars love Springfield.