Pulsos de Ferro

When a successful prizefighter known as "Killer" Agerra causes trouble in a nightclub, a New Jersey mill worker, Dundee Reilly, knocks him out. This impresses both Pat Malone, an ex-boxer, and Pat's attractive sister Mary, who takes a liking to Reilly. Reilly becomes a boxer under Pat's tutelage, but is framed for a crime and ends up serving nearly a year behind bars. When he gets out, Agerra's opponent in an upcoming fight drops out, so Pat Malone arranges for "Knockout" Reilly to be his replacement in the ring. Agerra is much too good for him. Reilly is on the verge of being knocked out when Mary Malone visits his corner and tells him it was Agerra who framed him and caused him to go to jail. A newly motivated Reilly knocks his foe flat.