Ele queria acesso aos experimentos de Hydra
A partir da novelização júnior de Age of Ultron :
Um desses experimentos pode ter sido relacionado ao corpo sintezóide que a Ultron fez, o que acabou se tornando a Visão. Essa era uma alta prioridade para ele, então faria sentido que ele quisesse pesquisar o que Hydra sabia sobre isso.The twins went back with Ultron to Strucker’s fortress, where they were astonished to see many more robots, all refining various experiments Strucker had been working on.
“You look like Strucker’s robotic experiments,” said Pietro. “But they didn’t work.”
“Not for him, they didn’t,” Ultron acknowledged. “Strucker had the engine, but not the spark.”