Tall and strong prisoner at Ryker's Island. He tries to run protection racket against his new inmate Frank Castle. Ten dollars per week and all his desserts, it is the price to pay. Frank Castle violently beats him up and subdues him, ordering him to be his informer. Castle is on the look for the one who could have drugged him during his last stay at Ryker's and The Mule is giving Frisky Martin away. Later, when Gregario shoots the Punisher, the Mule wants to settle some debts with Castle, but unfortunately, he is already dead.