The Grand Master is the leader of SKUL.
He was the only section leader to escape the MI9 assaults. His face is never seen on screen. He also has a pet rabbit, called General Flopsy, which the MI High team adopt after the Grand Master's arrest.
During The Fall of SKUL, he was arrested by MI9 and was later seen trembling in fear upon hearing The Mastermind's message. In Trojan KORPS, the MI High team turn to the Grand Master for advice on what KORPS are up too. He then helps them, on the condition that they adopt General Flopsy.