Hoppy, California and Johnny partner up with brother and sister ranch owners, two of several who are having their access to water blocked by a dam owned by a greedy merchant in town, who is intent on driving them out and taking their land for himself.
William Boyd
as Hopalong Cassidy
Andy Clyde
as California Carlson
Jay Kirby
as Johnny Travers
Teddi Sherman
as Lucy Whitlock
George Reeves
as Lin Whitlock
Victor Jory
as Jeb Hardin
Douglas Fowley
as Joe Brass
Earle Hodgins
as Wildcat Willie
Herbert Rawlinson
as Rancher Varney
Robert Mitchum
as Dirk Mason
Dewey Robinson
as Sam the Bartender
Russell Simpson
as Sheriff
