Filmography
- Slaughterhouse-Five (1972), in the role of Roland Weary
- Portnoy's Complaint (1972), in the role of Smolka
- F.I.S.T. (1978), in the role of Vince Doyle
- Paradise Alley (1978), in the role of Stitch
- The Scarlet Letter (1979), in the role of Roger Chillingworth
- The Lathe of Heaven (1980), in the role of Dr. Wiliam Haber
- The Funhouse (1981), in three roles, including that of Conrad Straker the Funhouse Barker
- The Elephant Man (1982) as Frederick Treves
- Miami Vice episode "Walk-Alone" (first aired October 17, 1986) as a corrupt prison warden
- Funny Farm (1988), in the role of Crum Petree
- Homeboy (1988), in the role of Grazziano
- Jennifer 8 (1992) in the role of Chief Citrine
- Star Trek: The Next Generation episode "Rightful Heir" (1992), in the role of Kahless the Unforgettable's clone
- Gettysburg (1993), in the role of Sgt. Buster Kilrain
- Streets of Laredo, (1995), in the role of Mox Mox
- The Quick and the Dead (1995), in the role of Eugene Dred
- Looking for Richard (1996), in the role of William Hastings
- Mercury Rising (1998), in the role of Joe Lomax
- The Outer Limits (1995–2002), in the role of the control voice
- Oz (1999–2003), in the role of Seamus O'Reily
- Thirteen Days (2000), in the role of Gen. Curtis LeMay
- Black Knight (2001), in the role of King Leo
- Mark Twain (2001) as the voice of Mark Twain
- Gods and Generals (2003), reprising the role of Sgt. Buster Kilrain
- Mystic River (2003), in the role of Theo (uncredited)
- Unforgivable Blackness: The Rise and Fall of Jack Johnson (documentary) (2005), as the voice of Jack London
- Invincible (2006), in the role of Frank Papale
- The Bronx Is Burning (2007) in the role of Gabe Paul
- The National Parks: America's Best Idea (2009) as the voice of various historical figures
- The Dust Bowl (2012) as the voice of Ernie Pyle
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