Hoppy is leading a scientific expedition and the Chinese who have a hidden settlement nearby are trying to stop them. Saulters and his outlaw gang are also in the area looking for a gold mine. When Saulters men attack, the gold mine is found. Hoppy agrees to file for the Chinese and heads after Saulters in the chase to the land office.
William Boyd
as Hopalong Cassidy
Andy Clyde
as California Carlson
Brad King
as Johnny Nelson
Soo Yong
as May Soong
Barbara Britton
as Jennifer Kendall
Douglas Fowley
as Slade Salters
Keith Richards
as Clay Elliott
Richard Loo
as Quan
Lee Tung Foo
as Doy Kee
Gordon Hart
as Malcolm Birdsall
Earl Gunn
as Clanton
Ian MacDonald
as Hollister
