While we've previously considered the original Metal Men of two Earths, there were other elemental beings created on Earth-One that did not have humanity's best interests at heart. Since they, well, had none to speak of...they were automatons after all.
During a space voyage, the Metal Men's interstellar vessel is disabled. While attempting repairs on its exterior, team creator Dr. Magnus transforms into a robot himself. Striking out against his creations who see his demeanor change from good to evil, Magnus creates the Gas Gang consisting of members Oxygen, Helium, Carbon Monoxide, Chloroform and Carbon Dioxide. They are resurrected twice more once to battle the then evil Metal Men and later by the team's forgotten member Nameless as an act of vengeance.
While Hebert Crawford of Earth-Two never got around to creating his own Metal Men, having recruited ones from hyperspace Jupiter instead, he himself turned into a metal man and displayed the various qualities of his team i.e. gold, silver, iron, magnesium, and copper, becoming living manifestations of each of these elements. He was cured of his insanity thanks to the intervention of the Justice Society of America.