Judge Logan is Dredd's assistant.
He has made a number of appearances, first in 2003 in the story "The Satanist" before appearing in the Total War storyline and in "Origins". In "Origins" he was severely wounded in action and required major surgery, including an artificial lung, arm and spleen. In "Tour of Duty" he was promoted to senior judge. Shortly afterwards he personally discovered the evidence which resulted in Chief Judge Sinfield's conviction and removal from office.
In "Day of Chaos" he again lost his arm in an encounter with Judge Mortis and was hospitalised. The encounter left him traumatised, unable to get the experience out of his head.