On 'Seinfeld's' 25th Anniversary: 25 Actors You Forgot Were on the Show

PHOTO: From left to right, Michael Richards as Cosmo Kramer, Jerry Seinfeld as Jerry Seinfeld, Julia Louis-Dreyfus as Elaine Benes, Jason Alexander as George Costanza are seen in this undated image.
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Today marks the 25th anniversary of the greatest sitcom that was "about nothing."

"Seinfeld" launched 25 years ago on July 5, 1989 and still resonates in pop culture lore, with quotes and episodes talked about today, almost 16 years after the series finale.

Aside from launching the careers of Jerry Seinfeld, Jason Alexander and Julia Louis-Dreyfus, the iconic show also featured a slew of other stars well before their prime. In honor of the milestone, here are 25 actors and actresses that you probably forgot were on the show:

(And yes, we realize there are probably hundreds of guest stars, so we tried to pick a good 25!)

PHOTO: Kathy Griffin
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Kathy Griffin

The comedian played Sally Weaver.

Debra Messing

The "Will & Grace" star played Beth.

Kristin Davis

The "Sex & The City" star played a love interest of Jerry's.

PHOTO: James Spader attends an evening with "The Blacklist" at Florence Gould Hall in this April 2, 2014, file photo in New York City.
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James Spader

"The Blacklist" star played a childhood friend of Jerry and George's.

PHOTO: Actor Jon Voight arrives at the Jewish Life Foundations Salute To Hollywood Gala Benefiting Holocaust Educational Programming In Schools and On JLTV at The Four Seasons Hotel, June 8, 2014, in Beverly Hills, Calif.
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Jon Voight

Angelina Jolie's father played himself when George thought he bought his old car.

Amanda Peet

Peet played Linette, another love interest for Jerry.

PHOTO: Courteney Cox is pictured on April 24, 2014 in New York City.
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Courteney Cox

The "Friends" star played Meryl, another girlfriend of Jerry's.

PHOTO: Actress Jennifer Coolidge attends the 3rd Annual American Humane Association Hero Dog Awards at The Beverly Hilton Hotel in this Oct. 5, 2013, file photo in Beverly Hills, Calif.
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Jennifer Coolidge

Stifler's mom from "American Pie" played the masseuse, who Jerry wanted to get a massage from.

Jeremy Piven

The "Entourage" star auditioned to play George in his pilot for NBC.

Denise Richards

Richards played Molly, the daughter of the chairman of NBC.

Molly Shannon

The "Saturday Night Live" vet played Sam.

PHOTO: Lisa Edelstein attend the 2014 NBCUniversal Cable Entertainment Upfronts at The Jacob K. Javits Convention Center on May 15, 2014 in New York City.
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Lisa Edelstein

The "House" star played George's girlfriend.

PHOTO: Mariska Hargitay attends the Sexual Assault Kit Evidence Submission Act press conference at Frank Murphy Hall of Justice, March 10, 2014, in Detroit.
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Mariska Hargitay

She was the girl who had chemistry with Jerry while auditioning to play Elaine on his pilot.

Brad Garrett

He played Jerry's mechanic.

PHOTO: Marcia Cross attends the Life Ball 2014 at City Hall on May 31, 2014 in Vienna, Austria.
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Marcia Cross

The "Melrose Place" star played a doctor yet again.

PHOTO: Actress Lauren Graham arrives at the 30th Annual PaleyFest: The William S. Paley Television Festival featuring "Parenthood" at the Saban Theatre in this March 7, 2013, file photo in Beverly Hills, Calif.
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Lauren Graham

Graham played another love interest for Jerry.

Catherine Keener

Keener played another love interest for Jerry, you get the point.

Jon Favreau

The "Iron Man" star played Eric the Clown, who argues with George.

PHOTO: Michael Chiklis attends the 55th Annual Womens Guild Cedars-Sinai Gala held in this Nov. 13, 2012, file photo in Beverly Hills, Calif.
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Michael Chiklis

"The Shield" star played a friend of the gang.

Bryan Cranston

Yep, even "Breaking Bad's" Cranston played Jerry's dentist.

PHOTO: Actress Megan Mullally attends the premiere of "Trouble Dolls" during the 2014 Los Angeles Film Festival at Regal Cinemas L.A. Live on June 15, 2014 in Los Angeles, Calif.
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Megan Mullally

She played one of George's girlfriends.

Teri Hatcher

"They're real and they are spectacular." You know who Hatcher played.

PHOTO: Debra Jo Rupp attends the Off Broadway opening night After Party for "Becoming Dr. Ruth" at The Westside Theatre in this Oct. 29, 2013, file photo in New York City.
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Debra Jo Rupp

"That 70's Show" star played Katie.

Anna Gunn

Another "Breaking Bad" star, she played Amy.

PHOTO: Actress Marlee Matlin attends the premiere of "Operation Change" at Paramount Studios on June 18, 2014 in Los Angeles, Calif.
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Marlee Matlin

The Oscar winner played Laura.

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