Gustav was a patient at the Big House when a mass blackout occurred that caused 74 other supervillains across the U.S. to breakout of their specialized prisons.[1]

Later, Gustav and the rest of the Serpent Society had attacked the Avengers after taking hostages in the subway. Ant-Man tried to appeal to their human side, but they had been convinced that Madame Hydra of Hydra had promised to assist them. It was later revealed that Ultron had been the one to call them which led them to distracting the Avengers from Ultron's real plan. While fighting the team, Rattler had used his tail to attack Captain America, but Cap was able to deflect his blast using his shield. Eventually, the team was losing and fled the scene.[2]

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