Bio: This Electro is the giant robot built and controlled from afar during the days of World War II. While searching through the S.S. headquarters with eleven other heroes for any snipers or Nazi soldiers, the heroes were ambushed and fell through the floor into a secret tunnel. The tunnel was then filled with gas which knocked the heroes out. The electronic signal that Electro received to allow it to operate, was cut off because of it's whereabouts. The heroes were then placed in cryogenic chambers where the Nazis planned to run tests on them.
Russian forces had invaded Berlin during this time, and were able to capture the Nazi scientists. With their captors now captured, the twelve were forgotten, and most presumed dead or destroyed.
Recently, the twelve heroes were discovered when a construction site discovered them in the chamber they had been placed in, never having aged. The American government was able to lay claim to the twelve heroes and have them brought back to America, where they've been trying to manipulate them into working for the government in a post Civil War society.