Sue Harmon 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.—Maurice VanAuken <[email protected]>

"Hopalong" Cassidy (William Boyd), and his two pals, "California" Carlson ('Andy Clyde') and "Lucky" Jenkins ('Rand Brooks'), join an expedition seeking buried Indian-relics, headed by Dr. Sue Harmon (Betty Alexander), and her assistant Dr. Grimes Atwood (Douglas Evans'). The greed of the latter almost brings ruination to the quest.—Les Adams <[email protected]>

Hoppy searches for a tribe of Indians, presumably descendants of the Aztecs. A band of outlaws tries to discredit the Indians by committing crimes while dressed as Indians. An archaeologist finds gold relics in the Indian burial grounds and hooks up with the bad guys to get them for himself.—Ed Stephan <[email protected]>