cast
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John Wayne
Col. Cord McNally
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Jorge Rivero
Capt. Pierre Cordona
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Jennifer O'Neill
Shasta Delaney
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Jack Elam
Phillips
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Christopher Mitchum
Sgt. Tuscarora Phillips
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Victor French
Ketcham
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Susana Dosamantes
Maria Carmen
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Sherry Lansing
Amelita
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David Huddleston
Dr. Ivor Jones
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Mike Henry
Rio Lobo Sheriff 'Blue Tom' Hendricks
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Bill Williams
Blackthorne Sheriff Pat Cronin
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Jim Davis
Riley
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Dean Smith
Bide
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Robert Donner
Whitey Carter
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George Plimpton
George, Whitey's 4th Henchman
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Edward Faulkner
Lt. Harris
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Peter Jason
Lt. Ned Forsythe
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Chuck Courtney
Chuck, Whitey's 2nd Henchman
- Robert Rothwell Whitey's 3rd Henchman
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Don 'Red' Barry
Feeny - Bartender (uncredited)
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Sondra Currie
Blackthorne Prostitute (uncredited)
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Chuck Hayward
(uncredited)
- Conrad Hool Bart (uncredited)
- Lance Hool Picket (uncredited)
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John Hudkins
Rio Lobo Deputy (uncredited)
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Michael Jeffers
Barfly in Blackthorne (uncredited)
- Frank Kennedy Minor Role (uncredited)
- Richard LaMarr Man in Army Post Saloon (uncredited)
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John McKee
Rio Lobo Deputy (uncredited)
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Boyd 'Red' Morgan
Train Engineer (uncredited)
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William H. O'Brien
Man in Army Post Saloon (uncredited)
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Gregg Palmer
Pete - Henchman (uncredited)
- Jim Prejean Union Soldier (uncredited)
- Rudy Robbins Man (uncredited)
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Chuck Roberson
Corporal in Baggage Car (uncredited)
- Danny Sands Man Delivering Message to Jail (uncredited)
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Cap Somers
Card Player (uncredited)
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Bob Steele
Rio Lobo Deputy (uncredited)
- Tommy Tedesco Guitar Player in Opening Credits (uncredited)
- Ethan Wayne Boy (uncredited)
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Hank Worden
Hank - Hotel Clerk (uncredited)