Stanley Snyder (スタンリー・スナイダー Sutanrī Sunaidā) is an ex-military officer working for Dr. Xeno.[11] He is the one who initially assaults Senku's group once they disembark on the territory of the former United States.[12] Once Xeno has been captured by the Kingdom of Science, Stanley pursues them on their way to South America in order to retrieve his longtime friend and leader.[13] He is the secondary antagonist of the New America City Arc and the primary antagonist of the South America Arc.