Nightshade - Tilda Johnson is an extraordinary genius, and extensively self-taught in genetics, biochemistry, cybernetics, robotics and physics. She has created an array of advanced weaponry, and has built numbers of humanoid robots. She created a chemical serum to transform normal humans into werewolves under her control and has used concentrated pheromones to control men through her allure. Nightshade apparently secretes chemical pheromones from her body that affect the will of certain animals, including werewolves, making them obedient to her commands. She first appeared in Captain America #164