Steve Carrell and Stephen Colbert as the "Ambiguously Gay Duo."
James Avery (aka Uncle Phil) as Shredder.
Jaleel White as Sonic the Hedgehog
J.K. Simmons as the Yellow M&M!
And Tenzin from The Legend of Korra
And Jeff Goldblum as the also-evil Verminous Skumm
Oh and Levar Burton as Kwame.
Michael Cera as Brother Bear
Burt Reynolds as Charlie B. Barkin in All Dogs Go To Heaven
George Clooney as Dr. Gouache on South Park
Brittany Murphy as Luanne from King of the Hill
Vin Diesel as the Iron Giant
Robert Downey Jr. as Peter Pewterschmidt
Tim Curry as Nigel Thornberry on 'The Wild Thornberrys.'
The Black Eyed Peas' Fergie as Sally Brown
Kelsey Grammer as Sideshow Bob
Earle Hyman as Panthro on ThunderCats
Constance Shulman from 'Orange Is The New Black' as Patti Mayonnaise on 'Doug.'
Phil Hartman as Mr. Wilson from 'Dennis the Meanace'
Jessica Walter from 'Arrested Development' as Fran from 'Dinosaurs'
Scarlett Johannsson as Mindy in The SpongeBob SquarePants Movie
And... Mel Gibson as John Smith in Pocahontas.
Meg Ryan as the evil Dr. Blight on Captain Planet and the Planeteers