Appeared as Palmer Kirby in the ABC blockbuster miniseries, "The Winds of War"
Miscast as private eye Lew Archer in the pilot, "The Underground Man" (Brian Keith as cast in the subsequent series)
Narrated the documentary feature, "The Rise & Fall of the Soviet Union"
Provided the voices of General Sherman and General McClellan for "Smithsonian's Great Battles of the Civil War," a miniseries on The Learning Channel
Reprised role as Maj. Frank Whittaker in "Court-Martial," a mid-season replacement series on ABC
Reprised the role of Palmer Kirby for the ABC sequel miniseries, "War and Remembrance"
Worked as a radio announcer while in college
Debut as a TV series regular, played the rancher and adoptive single father in NBC's Western series, "Fury" (retitled Brave Stallion in syndication runs)
Hosted the NBC documentary special, "The Unexplained: Witches, Werewolves & Vampires... Are They Real?"
Joined the cast of the popular espionage series "Mission: Impossible" (CBS) during its second season as special agent Jim Phelps; earned Golden Globe (1969, 1970) and Emmy (1969) nominations for Best Actor
Appeared as Major Noah Cooper, commander of the Fighting 69th squadron, in the NBC TV series "Buck Rogers in the 25th Century"
Co-starred as Maj. Frank Whittaker in "Court-Martial," the pilot for a military legal series (aired as two episodes of NBC's "Kraft Suspense Theater")
First starring role in a film, "Red Planet Mars"
Hosted the revival of "Biography," a documentary profile series on A&E
Reprised the role of Captain Oveur for "Airplane II: The Sequel"
Reprised the role of Jim Phelps in the feature "Mission: Impossible vs. the Mob"
Starred as Jim Kingsley in "Call to Danger," the initially unaired pilot for "Mission: Impossible," which aired as part of the summer replacement series "Premiere"
Starred in the ABC TV-movie, "Dead Man on the Run," as a special government agent
Starred in the syndicated Australia adventure series, "Whiplash," as a pioneering stage coach company owner
Film acting debut, "Rogue River"
Had a memorable supporting role as a German spy in Billy Wilder's "Stalag 17"
Had a recurring role as Colonel John Camden on the WB series, "7th Heaven"
Hosted "Discover: The World of Science," a series of documentary specials on PBS
Hosted and narrated "Strange Places," a syndicated documentary series
Parodied his Biography work in the film "Men in Black II," hosting an exposé television show
Played a father on the run from the law in Charles Laughton's "The Night of the Hunter"
Received a star on the Hollywood Walk of Fame
Reprised the role of Jim Phelps for the ABC revival of "Mission: Impossible"
Starred as Captain Oveur in the hit feature comedy, "Airplane!"
Starred as Douglas Warfield, an undercover federal agent, in the CBS TV-movie pilot, "Call to Danger"