Brad King

Jimmy's father, a rancher, died in suspicious circumstances. To make things worse, Jimmy's disreputable undcle has a plot to take over the ranch. Jimmy turn to his friend Brad, the Marshal, for help.

A New Yorker, Brad King, travels through the jungles of Panama to find the indigenous people he photographed and befriended 20 years ago.

Some Easterners intend to seize a tract of valuable timber land. Hoppy must try to stop them before they blow up a major dam and achieve their goal.

When cattle rustlers trouble a rancher who once was part of the Bar 20 crew, Hopalong Cassidy and the rest of the gang join forces to bring them down.