The John Wesley Powell expedition of 1869 explores the dangerous Colorado River, withstands internal dissension, and finally discovers the Grand Canyon.
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
