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Viper (real name Ophelia Sarkissian, formerly known as Madame Hydra) is a supervillain appearing in American comic books published by Marvel Comics. She is a foe of the Avengers and the X-Men.
Madame Hydra/Viper
Captain America
for Captain America in Sorting Fictional Characters by their Arch-enemy
Suggested by adrianabengozarlopez
Every story needs a villain, to face off against the hero. They need... a nemesis.
