Blanche Sitznski (a.k.a. Anaconda) is a Marvel character and supervillain from The Avengers: Earth's Mightiest Heroes. She is a member of the Serpent Society.
Anaconda and the Serpent Society, led by the evil King Cobra, battled the Avengers in a subway. Unfortunately, Hank Pym's paficist decisions cause the Serpent Society to escape.
In the wake of the Skrull invasion, Anaconda and the rest of the Serpent Society face Captain America and Spider-Man in order to free King Cobra and Viper.