Brian Keith as William Dunn

Ben Johnson as George Bradley

John Beal as Maj. John Wesley Powell

James Drury as Walter Powell

R.G. Armstrong as Oramel Howland

L.Q. Jones as Billy Hawkins

Dan Sheridan as Jack Sumner

Stan Jones as Seneca Howland

David Frankham as Frank Goodman

Roy Barcroft as Jim Baker

Jack Big Head as Ashtishkel

Pat Hogan as Indian chief

Dawn Little Sky as Indian woman

David Stollery as Andrew 'Andy' Hall

Ray Walker as