The Ultimate Five Assassins vs. Bo-bobo All Stars! (Japanese: 必殺五忍衆VSボーボボオールスターズ!赤ちゃんへっくんも大暴走!バブ♥ The Killer 5 Ninshu vs. Bo-bobo All Stars! Baby He-kun Runs Wild Too! Babu♥) is the thirty-first episode of the Bobobo-bo Bo-bobo anime. It was first broadcast in Japan on September 4, 2004, and in the United States on June 3, 2006.