14. Donald Sutherland
Character: Hollis Hurlbut, head of the Springfield Historical Society
Episode: 'Lisa The Iconoclast', Season 7 ('95-'96)
According to producer Bill Oakley, the part of fatherly but lie-peddling historian Hurlbut was written with Sutherland in mind.
Sutherland wanted to start voicing the script in the middle - as he would in a film - in order to get to know the character better, but this wasn’t possible and he had to ditch the thesping and just get on with it.
Weird fact: Sutherland had earlier played a character called Homer Simpson in The Day Of The Locust (1975).
13. Leonard Nimoy
Character: Himself, opening Sprinfield’s new monorail system
Episode: 'Marge Vs. The Monorail', Season 4 ('92-'93)
Nimoy was so good as a sci-fi nerd-baiting version of himself unveiling the town’s new monorail (“I’d say this vessel could do at least Warp 5!”) that he came back to do it all again for the show's X-Files tie-in.
George Takei was offered the part first, but turned it down on grounds that he thought it might conflict with his position on the Southern California Rapid Transit District board of directors. Diva!
12. Stan Lee
Character: Himself, visiting the comic-book store
Episode: 'I Am Furious, Yellow', Season 13 (2001-2002)
The creator of Spider-Man and the Hulk (whose green fury is a big influence on the episode) appears as a deranged, childish and brilliant version of himself in Springfield’s comic-book store...
Stan Lee: “Hold it son. Wouldn't you rather have an exciting action figure?”
Database: “Ahh, but only Batman fits in my Batmobile.”
Stan Lee: “Are you nuts? The Thing fits in there perfectly. Look, he's fitting right now.”
Database: “AHH! You broke my Batmobile!”
Stan Lee: “Broke? Or made it better?"