Caesar Clown (シーザー・クラウン Shīzā Kuraun), also referred to as "Master" (マスターMasutā) by his underlings, is a former colleague of Vegapunk and the primary antagonist of the Punk Hazard Arc in the anime and manga, One Piece. Caesar is the leading expert on mass-murder weapons and is a mad scientist with a bounty of 300,000,000 beri on his head.