Madame Viper, also known as Viper or Madame Hydra, is a villainess from the Marvel comics and one of the leaders of the terrorist organization, HYDRA. She is an enemy of Captain America, Spider-Woman, and the Avengers. A classic nihilist, Madame Viper is also completely intolerant of failure, and every agent who has ever failed her has been executed without delay. For all of her capacity for cruelty though Madame Viper is also driven, determined, cunning, and ambitious, and these traits mixed with her complete lack of redeeming qualities makes her a dangerous threat indeed.