2000s
The Metal Men then reappeared during the Infinite Crisis storyline (Infinite Crisis #1–7, December 2005 – June 2006, Villains United #1–6, July–December 2005), battling the O.M.A.C. cyborgs and acting as part of a superhero strike force assembled to protect the city of Metropolis from the Secret Society of Super Villains. Several of the Metal Men appeared in Justice League of America (vol. 2) #1 (August 2006), with the events of the limited series eventually revised and presented as a delusion suffered by Doctor Magnus in 52, #22 (October 2006).
The entire group reappeared in Superman/Batman #34–36 (May, July–August 2007), having been rebuilt and upgraded and including a new female member, the sarcastic Copper. Employed by Lucius Fox as security for WayneTech, the Metal Men temporarily fall under the influence of Brainiac. The group starred in another eponymous limited series, running for eight issues (Metal Men (vol. 3) #1–8 October 2007 – June 2008). David Magnus, another brother of Will and Mike Magnus, attempts to avert a catastrophic future and prevent the creation of the group, and uses a device stolen from the villain T. O. Morrow to change the Metal Men into evil, radioactive versions based on other metals, called the Death Metal Men: Uranium (Iron), Strontium (Mercury), Thorium (Platinum), Radium (Gold), Lithium (Copper), Polonium (Lead), and Fermium (Tin). Doctor Magnus, however, is able to reverse the process and with the Metal Men and the assistance of the alien robot L-Ron, defeating his brother.
The Metal Men also featured in a stand-alone story in the weekly publication Wednesday Comics (#1–12, September–November 2009), and co-starred in the first seven issues of Doom Patrol (vol. 5, October 2009 – April 2010). This series was later reprinted in DC Comics Presents: Metal Men 100 Page Spectacular (2011).
The Metal Men appeared in Justice League: Generation Lost #10–11 (November–December 2010). Captured by villain Maxwell Lord, the Metal Men are reprogrammed and believe themselves to be humans living in a magical fantasy world. At Lord's behest, the brainwashed Metal Men attack the members of the new Justice League International (thinking them monsters), and merge into their alternate universe persona Alloy (from the limited series Kingdom Come (#1–4, May–August 1996)), but are eventually defeated.