Rattler

Rattler is a member of the Serpent Society.

The Avengers: Earth's Mightiest Heroes
Rattler and the Serpent Society, led by 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, Rattler and the rest of the Serpent Society face Captain America and Spider-Man to free King Cobra and Viper.