Credits

• 1999 · Battlestar Galactica: The Second Coming as Baltar
• 1998 · My Father's Shadow: The Sam Sheppard Story as Richard Eberle
• 1998 · The Windsor Protocol as Gerhardt Heinzer / Albert Greenfield
• 1997 · The Last Don as Eli Marrion
• 1995 · No Contest as Senator Donald Wilson
• 1993 · Star Trek: Deep Space Nine as Kor
• 1992 · X-Men as Apocalypse (voice)
• 1990 · In Defense of a Married Man as Charles Evers
• 1989 · Love and Hate: The Story of Colin and Joanne Thatcher as Serge Kujawa
• 1988 · Shadow Dancing as Anthony Podopolis
• 1988 · War of the Worlds as Quinn
• 1987 · Nowhere to Hide as General Howard
• 1985 · The New Alfred Hitchcock Presents as Carter Talbot
• 1985 · The New Alfred Hitchcock Presents as Lestrade / Moriarty
• 1983 · The Hitchhiker as Mr. Stregga
• 1983 · Scarecrow and Mrs. King as
• 1983 · American Caesar as Self - Narrator
• 1981 · The Postman Always Rings Twice as Nick Papadakis
• 1980 · Conquest of the Earth as Baltar
• 1980 · Phobia as Inspector Barnes
• 1980 · The Changeling as Captain DeWitt
• 1980 · The Starlost: The Beginning as The Governor
• 1979 · The Paradise Connection as Maj. Derek Barclay-Battles
• 1979 · Mission Galactica: The Cylon Attack as Baltar
• 1979 · King Solomon's Treasure as Allan Quatermain
• 1978 · Vega$ as
• 1978 · Battlestar Galactica as Count Baltar
• 1978 · Battlestar Galactica as Baltar
• 1978 · The Bastard as Lord North
• 1977 · The Hardy Boys / Nancy Drew Mysteries as
• 1976 · Quincy, M.E. as
• 1976 · Charlie's Angels as Anton Karazna
• 1976 · Drum as Bernard DeMarigny
• 1976 · Breaking Point as Vincent Karbone
• 1976 · The Whiz Kid and the Carnival Caper as Moroni
• 1975 · Wonder Woman as Ambassador Orrick
• 1975 · Switch as Gilchrist
• 1975 · A Matter of Wife... and Death as Joe Ruby
• 1975 · Bronk as
• 1975 · The Hecklers as Narrator
• 1974 · Harry O as
• 1974 · Petrocelli as
• 1974 · The National Dream as Cornelius Van Horne
• 1974 · The Six Million Dollar Man as General Norbukov
• 1973 · The Magician as Paul Gunther
• 1973 · The Starlost as The Governor
• 1973 · Portrait: A Man Whose Name Was John as Numan Menemengioglu
• 1973 · Scorpio as McLeod
• 1973 · Tennessee Williams' South as
• 1972 · The Wrath of God as Col. Santilla
• 1971 · Goodbye, Raggedy Ann as Paul Jamison
• 1971 · Red Sky at Morning as Jimbob Buel
• 1971 · Raid on Rommel as Sgt. Maj. Allan MacKenzie
• 1971 · Doctors' Wives as Mort Dellman
• 1970 · Night Gallery as Survivor (segment "Lone Survivor")
• 1970 · The Young Rebels as
• 1969 · Anne of the Thousand Days as Cromwell
• 1969 · Medical Center as
• 1969 · Medical Center as Harry Weldman
• 1969 · Then Came Bronson as
• 1968 · Hawaii Five-O as Lorenzo Corman
• 1968 · Hawaii Five-O as Mr. Thorncrest
• 1968 · The Name of the Game as Rafael
• 1968 · It Takes a Thief as The Man
• 1967 · Mannix as Eddie Lee Prentiss
• 1967 · Mannix as Dr. Myles Considine
• 1967 · The High Chaparral as Matthew Kendall
• 1966 · Mission: Impossible as Chief of Internal Security Manuel Ferrar
• 1966 · Mission: Impossible as Commissioner Taal Jankowski
• 1966 · Mission: Impossible as Milos Kuro
• 1966 · Star Trek as Kor
• 1965 · The F.B.I. as Logan
• 1965 · Les ludions as
• 1964 · Profiles in Courage as Patrick Henry
• 1961 · The Defenders as District Attorney
• 1958 · Wuthering Heights as Hindley
• 1957 · War Drums as Chino
• 1956 · Breakaway as First Kidnapper
• 1956 · Bond of Fear as Dewar
• 1956 · Passport to Treason as Pietro
• 1955 · Gunsmoke as Judge Flood
• 1955 · Barbados Quest as Mustachioed Henchman (as John Collicos)
• 1954 · The Wonderful World of Disney as Moroni
• 1951 · Hallmark Hall of Fame as Lucentio
• 1951 · Hallmark Hall of Fame as Tom Pettigrew
• 1951 · Hallmark Hall of Fame as Comte de Guiche
• 1948 · Studio One as Gold Root