Ralph Fiennes plays Charles Van Doren, a contestant on the quiz show who becomes a household name.
Rob Morrow portrays Richard Goodwin, a congressional investigator who looks into the quiz show scandal.
John Turturro plays Herbert 'Herb' Stempel, a former contestant who exposes the quiz show's rigging.
David Paymer takes on the role of Dan Enright, the producer of the quiz show who is involved in its manipulation.
Hank Azaria plays Albert Freedman, another producer who works on the quiz show and is implicated in the scandal.
Paul Scofield portrays Mark Van Doren, the father of Charles Van Doren and a respected professor.
Christopher McDonald plays Jack Barry, the host of the quiz show who seeks to maintain its popularity.
Allan Rich portrays Robert Kintner, an executive involved in the production of the quiz show.
Martin Scorsese plays Martin Rittenhome, a minor character in the film.
Elizabeth Wilson plays Dorothy Van Doren, the mother of Charles Van Doren, who grapples with the scandal.
Mira Sorvino portrays Sandra Goodwin, Richard Goodwin's supportive girlfriend.
George Martin plays Chairman Harris, a figure involved in the oversight of the quiz show system.
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