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Klaus 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. He fought Ant-Man during his escape.[1]

Later, Klaus and the rest of the Serpent Society had attacked the Avengers after taking hostages in the subway. Ant-Man tried to appeal to his human side, but Klaus 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.[2]



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