Sue Morgan gets Hoppy and his friends to join their expedition looking for Indian artifacts. Expedition leader Atwood makes a deal with nearby cattle rustler Morgan to loot the Indian treasures instead and sell them. Hoppy is on to their plan and pretending to leave follows them. Not only is he outnumbered by Morgan's men, but California has himself about to be sacrificed in an Indian ritual.
William Boyd
as Hopalong Cassidy
Andy Clyde
as California Carlson
Rand Brooks
as Lucky Jenkins
Betty Alexander
as Sue Harmon
Fritz Leiber
as Chief Xeoli
Douglas Evans
as Grimes Atwood
Harry Cording
as Morgan
Francis McDonald
as Kane
