Before we consider that episode, consider the introducing to the Metal Men of Jupiter, as they would be known. The first appearance of such creatures was in October 1942, when the Justice Society members were Shanghaied in Space by Nazi scientist Gootsden under the orders of no less than Adolph Hitler. Among the exiles was Starman, who ended up on the planet Jupiter, or so he initially thought until he realized that this was another planet in hyperspace he arrived at under diress:
Upon being introduced to a benevolent race of metallic armored beings with human-like organs housed within their mobile structures, these Metal Men implored Starman to assist them in removing the Red Spot which was a living organism threatening that world. After a heroic sacrifice by one of their number who accompanied the Cosmic Crusader, Starman realized that his gravity rod had immunized him to the adverse effects to this planet which also proved toxic to the entity. Constructing a massive gravity rod with the aid of his near allies there, the Red Spot was sent into space. And Starman was sent back to his Earth with technology that would enrich his world. Or not, since it was never referred to again.
On Earth-One, the first of the Metal Men introduced with the sole Metal woman, Platinum aka Tina, who was a personal favorite of their creator Doctor Magnus. Other models based on various other metallic substances would appear briefly from time to time. However, besides Tina there would be five others that would be the Metal Men.