Episode 8F02 - ' Treehouse of Horror II'.

Episode 8F05 - ' Like Father, Like Clown'.

Phil Hartman as Lionel Hutz and Troy McClure.

Neil Patrick Harris as Himself (playing Bart Simpson).

Joe Mantegna as Fat Tony and Himself (playing Fat Tony).

Although he provided his own voice for the dialogue, Kipp Lennon, a Jackson impersonator, did all the singing. NOTE: Michael Jackson was credited as John Jay Smith for this appearance.

Kipp Lennon as Leon Kompowsky (singing voice).

Michael Jackson as Leon Kompowsky (Credited as John Jay Smith).

Episode 7F21 - ' Three Men and a Comic Book'.

Episode 7F20 - ' The War of the Simpsons'.

Frank Welker as Santa's Little Helper and Additional Dogs.

Tracey Ullman as Sylvia Winfield and Emily Winthrop.

Episode 7F16 - ' Oh Brother, Where Art Thou?'.

Phil Hartman as Troy McClure, the Cable Guy, and Moses.

Episode 7F11 - ' One Fish, Two Fish, Blowfish, Blue Fish'.

Phil Hartman as Lionel Hutz and the voice of Heaven.

Episode 7F10 - ' Bart Gets Hit by a Car'.

Episode 7F09 - ' Itchy & Scratchy & Marge'.

Tony Bennett as Himself (First guest star to appear as himself).

Episode 7F01 - ' Two Cars in Every Garage and Three Eyes on Every Fish'.

James Earl Jones as Moving Man, Serak the Preparer and the Narrator.

Episode 7G01 - ' Some Enchanted Evening'.

Albert Brooks as Jacques (Credited as A.

Episode 7G11 - ' Life on the Fast Lane'.

Albert Brooks as Cowboy Bob (Credited as A.

Episode 7G09 - ' The Call of the Simpsons'.

Episode 7G04 - ' There's No Disgrace Like Home'.

Marcia Wallace as Edna Krabappel and Ms.

Episode 7G08 - ' Simpsons Roasting on an Open Fire'.

27 Guest stars that have appeared multiple times.

This is partially because the list becomes a lot more cluttered because she has guest starred in close to a hundred episodes, so although she is only credited a few times here, she has 'guest starred' in many episodes. Only the episodes in which her character Edna Krabappel plays a significant role are mentioned here. As well, Marcia Wallace has made many de facto appearances and has always been credited as a guest star. There are several non-regular voices who make appearances but are credited as 'also starring' and not guest voices. For the 20th anniversairy they made a special episode based on all the celebrities who have guest starred in The Simpsons. This list does not include those celebrities whose voices have merely been impersonated. Many episodes of iconic animated series The Simpsons feature celebrity guests contributing their voices to the show, whether as themselves or as fictional characters. This is a list of guest stars who appeared on The Simpsons. For people who rejected the show, see Intended guest stars.

The simpsons season 30 guest stars