Project U.F.O.

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William Jordan

Major Jake Gatlin

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Olan Soule

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Donna Douglas

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Lou Frizzell

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Joan Freeman

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David Hedison

Frederick Flanagan

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Robert Ginty

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Caroline McWilliams

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Allan Miller

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Cameron Mitchell

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Anne Lockhart

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James Olson

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Mills Watson

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Kenneth Mars

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Marlyn Mason

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Parley Baer

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Edward Winter

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Cal Bellini

Hank Stohl

Pilot

Scott Mulhern

Sgt. Eddie Larkin

David Yanez

Pauley Ramirez

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Tom Drake

First Neighbor

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Alf Kjellin

Carl Youngstrom

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Buck Young

Colonel at Forbes AFB Kansas

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Jack Webb

Narrator (uncredited)