US Border Patrolman Roy Rogers is assigned to prevent a herd of diseased cattle from crossing over from Mexico.

Roy Rogers
as Roy Rogers

Trigger
as Trigger

Dale Evans
as Cathy Marsh

Estelita Rodriguez
as Elena Madera

Pinky Lee
as Pinky

Anthony Caruso
as Lucky Grillo

Roy Barcroft
as Ward Sloan

Eduardo Jiminez
as Pancho Lopez

Ken Terrell
as Tony

Emmett Vogan
as Colonel Wells