Noah Adam Mahn is the main antagonist of the entire Extinctioners universe, he is the leader of the Invasion Force that caused much of the carnage in the first story-arc and the reason the Extinctioners were formed as a group: he is the only villain save for Xenif who is considered a Complete Monster on the TV Tropes page, though like all things this can be questioned - regardless of whether or not Noah Mahn is the most vicious enemy he is definitely one of the most powerful and dangerous with a devastating track-record that has rightfully made him and his Invasion Force greatly feared by almost all the main cast.