- 1994: Provided the voices of General Sherman and General McClellan for "Smithsonian's Great Battles of the Civil War", a miniseries on The Learning Channel
- 1994: Hosted "The Unexplained: Witches, Werewolves & Vampires... Are They Real?", An NBC documentary special
- 1992: Narrated the documentary feature "The Rise & Fall of the Soviet Union"
- 1989: Hosted the revival of "Biography", a documentary profile series on A&E
- 1988: Reprised the role of Palmer Kirby for the sequel miniseries "War and Remembrance"
- 1983: Appeared as Palmer Kirby in the blockbuster miniseries "The Winds of War"
- 1982: Reprised the role of Captain Oveur for "Airplane II: The Sequel"
- 1980: Starred as Captain Oveur in the hit feature comedy "Airplane!"
- 1975: Starred in the TV-movie "Dead Man on the Run", an unsold pilot, as a special government agent
- 1974: Miscast as private eye Lew Archer in the pilot "The Underground Man" (Brian Keith as cast in the subsequent series)
- 1973: Hosted and narrated "Strange Places", a syndicated documentary series
- 1973: Starred as Douglas Warfield, an undercover federal agent, on "Call to Danger", a CBS TV-movie pilot
- 1969: Reprised the role of Jim Phelps in the feature "Mission Impossible Vs. The Mob"
- 1969: Starred as Jim Kingsley in "Call to Danger", the initially unaired pilot for "Mission: Impossible", aired as part of the summer replacement series "Premiere" (aired again in 1971 as part of "Suspense Playhouse")
- 1966: Co-starred in "Court-Martial", a mid-season replacement series on ABC
- 1963: Co-starred in "Court-Martial", the pilot for a military legal series, aired as two episodes of NBC's "Kraft Suspense Theater"
- 1955: Important supporting role in Charles Laughton's "The Night of the Hunter"
- 1955: Debut as a TV series regular, "Fury/Brave Stallion", a Western family drama on NBC-TV
- 1953: Memorable supporting role as a German spy in Billy Wilder's "Stalag 17"
- 1952: First starring role in a film, "Red Planet Mars", a Cold War propaganda sci-fi film
- 1950: Film acting debut, "Rogue River"
- Played with bands
- Starred in the syndicated Australia-shot adventure series "Whiplash" as a pioneering stage coach company owner
- Joined the cast of the popular espionage series "Mission: Impossible" during its second season as special agent Jim Phelps
- Reprised the role of Jim Phelps for the revival of "Mission: Possible"
- Acted in summer stock
- Worked as a radio announcer while in college
- Hosted "Discover: The World of Science", a series of documentary specials on PBS




