James Ellison, Russell Hayden, Fuzzy Knight, Julie Adams, Tom Tyler, George J. Lewis, John Cason, Stanley Price, Stephen Carr, Dennis Moore, George Chesebro, Bud Osborne, Jimmy Martin
As a boy, Shamrock's parents were killed. He took possession of a pistol belonging to his father, a famous marshal. Now that he is grown, he takes the job of marshal and uses the same gun, but he still has to solve the mystery of what happened to his parents.