Grampus was the Deputy Chief Judge in "The Day The Law Died".
Grampus was the leader of an army of Kleggs : alien mercenaries hired by the insane tyrant Judge Cal to oppress the population during his reign of terror in 2101. He succeeded Judge Fish as Cal's deputy. When Cal announced his plan to gas the entire population to death, he allowed the Kleggs to leave, but before they could board their spaceships Judge Dredd led an assault to stop Cal. The Kleggs tried to surrender, but the judges slaughtered them anyway for their crimes, asking "When did anyone ever surrender to you?". Grampus was killed by judges Dredd, Giant and Kelso. He was succeeded by Deputy Chief Judge Pepper.