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Karl Swenson (July 23, 1908 – October 8, 1978) was an American theatre, radio, film, and television actor. Swenson is remembered for his role as the doomsayer in the diner in Alfred Hitchcock's The Birds (1963) and as the voice of Merlin in Disney's The Sword in the Stone (1963). On television, he had numerous credits in guest roles on various shows, especially Westerns, including episodes of Bonanza, The Virginian, and Gunsmoke. He had a major recurring role as Walnut Grove founder Lars Hanson on Little House on the Prairie (1974 - 1978). Swenson also had roles in The Prize (1963), Major Dundee (1965), The Sons of Katie Elder (1965), The Cincinnati Kid (1965), Seconds (1966), Hour of the Gun (1967), ...tick...tick...tick... (1970), The Wild Country (1970), Vanishing Point (1971) and Ulzana's Raid (1972). Born in Brooklyn, New York of Swedish parentage, he originally planned to be a doctor and studied at Marietta College before pursuing acting. Swenson appeared extensively on the radio from the 1930s through the 1950s. He entered the film industry in 1943 with two wartime documentary shorts, December 7 and The Sikorsky Helicopter. Swenson was married to actress Joan Tompkins. He died of a heart attack at Charlotte Hungerford Hospital in Torrington, Connecticut on October 8, 1978, shortly after filming the Little House on the Prairie episode in which his character dies. The episode aired on October 16, 1978, eight days after Swenson's death. He was interred at Center Cemetery in New Milford, Connecticut.

Disney Sing-Along Songs: Colors of the Wind
as (voice) (archive footage)

Disney's Sing-Along Songs: Under the Sea
as Merlin (archive footage) (voice)

Disney's Halloween Treat
as Merlin (voice) (archive footage)

The Amazing Spider-Man

Disney's Greatest Villains
as Merlin (voice) (archive footage)

Little House on the Prairie
as Lars Hanson

The Gun and the Pulpit
as Adams

Happy Days

Doc Elliot

Ulzana's Raid
as Rukeyser

Ghost Story
as Ed Barnes

The New Healers
as Mr. Fisherman

Emergency!
as Gus

A Howling in the Woods
as Apperson

Cannon

Vanishing Point
as Clerk

The Wild Country
as Jensen

The Odd Couple
as Captain Potter

The Immortal

The Young Rebels

… tick… tick… tick…
as Frank Braddock Sr.

The Mod Squad

The Outcasts

Hawaii Five-O
as Abel Morgan

Hour of the Gun
as Dr. Charles Goodfellow

Do Not Go Gentle Into That Good Night
as Dr. Keller

Judd, for the Defense

The Guns of Will Sonnett

Cimarron Strip

Ironside
as Vet
CBS Playhouse
as Dr. Keller

Brighty of the Grand Canyon
as Theodore Roosevelt

Seconds
as Dr. Morris

Mission: Impossible
as Colonel Dubov

The Rat Patrol
as Colonel Seidner

Tarzan

The Cincinnati Kid
as Mr. Rudd

Hogan's Heroes
as Dr. Karl Svenson

The Big Valley
as Bert Hadley

The Sons of Katie Elder
as Doc Isdell

Major Dundee
as Captain Waller
Profiles in Courage
as Chynoweth

Gomer Pyle, U.S.M.C.
as Col. Harper

The Prize
as Hilding

The Sword in the Stone
as Merlin (voice)

The Man from Galveston
as Sheriff

The Travels of Jaimie McPheeters
as Coley Bishop

Mr. Novak
as Mr. Haskell

The Bill Dana Show

The Fugitive
as Axel Nielsen - Service station owner
The Greatest Show on Earth

The Lieutenant

The Birds
as Le prophète de malheur ivre au bar

The Dakotas

How the West Was Won
as Train Conductor (uncredited)

General Electric True

The Alfred Hitchcock Hour
as George Sherston

The Virginian
as Col. Theodore Roosevelt

Sam Benedict

The Spiral Road
as Insp. Bevers