John Goodman Sullivan (voice) Billy Crystal Mike (voice) Mary Gibbs Boo (voice) Steve Buscemi Randall (voice) James Coburn Waternoose (voice) Jennifer Tilly Celia (voice) Bob Peterson Roz (voice) John Ratzenberger Yeti (voice) Frank Oz Jeff Fungus (voice) Daniel Gerson Needleman / Smitty (voice) Bonnie Hunt Flint (voice) Jeff Pidgeon Bile (voice) Samuel Lord Black George (voice) Jack Angel Additional Voices (voice) Bob Bergen Additional Voices (voice) Rodger Bumpass Additional Voices (voice) Gino Conforti Additional Voices (voice) Jennifer Darling Additional Voices (voice) Patti Deutsch Additional Voices (voice) Pete Docter Additional Voices (voice) Bobby Edner Additional Voices (voice) Ashley Edner Additional Voices (voice) Paul Eiding Additional Voices (voice) Bill Farmer Additional Voices (voice) Pat Fraley Additional Voices (voice) Teresa Ganzel Additional Voices (voice) Marc John Jefferies Additional Voices (voice) Joe Lala Additional Voices (voice) Sherry Lynn Additional Voices (voice) Danny Mann Additional Voices (voice) Mona Marshall Additional Voices (voice) Mickie McGowan Additional Voices (voice) Laraine Newman Additional Voices (voice) Kay Panabaker Additional Voices (voice) Bret Parker Additional Voices (voice) Phil Proctor Additional Voices (voice) Josh Qualtieri Additional Voices (voice) Guido Quaroni Additional Voices (voice) Jan Rabson Additional Voices (voice) Lisa Raggio Additional Voices (voice) Joe Ranft Additional Voices (voice) David Silverman Additional Voices (voice) Lee Unkrich Additional Voices (voice) Wallace Shawn Rex (voice) (uncredited)