Invincible Mask (無敵仮面, Muteki Kamen) is an extremely powerful high ranking pro hero who belongs to the planetary defense agency. Partnered with fellow powerhouse, heracles muscle, invincible mask is a towering, herculean individual who holds repute as The Toughest Man In The Universe (宇宙で最も過酷な男, Uchu De Mottomo Kakokuna Otoko), due to his uncanny and astounding ability to shrug off and completely resist even the most deadly and destructive of attacks. It seems that he is totally and completely invulnerable, immune to attacks from even the strongest monsters and mysterious beings alike, allowing him to crush even the toughest foes.