The Grand Master is the leader of SKUL.
Numerous failed missions to stop the Grand Master have led to his and his SKUL associates' increased capacity to threaten national security. He owns a white rabbit which he refers to as General Flopsy. The Grand Master's face is never seen on-screen; his features always being concealed in shadows or by a hat, sunglasses and scarf. He is always seen wearing his ceremonial robe which is referred to by Oscar, Rose and Carrie as a dressing gown. He has grey hair and is possibly in his late 50s/early 60s, but beyond that very little can be determined.
A ruthless, eccentric, and calculating megalomaniac, the Grand Master is a stereotypical master criminal in the series. He is an ambitious and sadistic man, with little regard for the safety of others. He is an adept tactician and puts great trust in his allies, if not being a little callous. He has an unusual relationship with his pet rabbit, Flopsy, who is a parody of Ernst Stavro Blofeld's cat in the James Bond series. In the first series, he is shown to be a very skilled vehicular driver and hand-to-hand combatant.