first appears in Superman: The Animated Series, voiced by Michael Dorn. Introduced in the episode "Prototype", he works as a designer for LexCorp and is tasked with creating prototype powered armor for the Metropolis Police Department's Special Crimes Unit. However, the suit's neural interface system has adverse psychological effects on its user, Sgt. Corey Mills. Encouraged by Superman, Irons works to perfect the suit with the help of his niece Natasha. In the episode "Heavy Metal", having been fired from LexCorp, he becomes the superhero Steel and helps Superman fight Metallo. Steel appears in Justice League Unlimited, voiced by Phil LaMarr. As of this series, he became a member of the expanded Justice League. John Henry Irons / Steel appears in Young Justice: Outsiders, voiced by Zeno Robinson. This version is a member of the Justice League. An alternate universe version of John Henry Irons appears in Superman & Lois, portrayed by Wolé Parks. Introduced as "Captain Luthor", this version is from an unidentified alternate Earth that was ravaged by an army of evil Kryptonians engineered by his Earth's Morgan Edge and led by Superman. Additionally, Irons was married to his Earth's Lois Lane and has a daughter named Natalie. After Lane exposed the Kryptonians' weakness to Kryptonite on the news, she was killed by Superman. In response, Irons and Natalie built a suit of steel armor and incorporated an A.I. (voiced by Daisy Tormé) he took from his Earth's Lex Luthor with a kinetic hammer as the main weapon. As he was unable to reprogram its recognition protocols, Irons was forced to go by "Captain Luthor". While testing a new weapon that could potentially kill Superman, Irons is transported to the "prime" Smallville, witnesses its Superman, and begins hunting him, believing he will inevitably turn evil. Along the way, Irons encounters the "prime" Lane and launches an investigation into her version of Edge. Irons later uses Lane to arrange a meeting with Superman and beats him after weakening him with red solar flares. Meanwhile, having obtained Irons' fingerprints to see if he was related to Luthor, Lane deduces Irons' identity and joins forces with her sons, Jonathan and Jordan, to save Superman while the Department of Defense (DOD) take Irons into custody. He is later released after Lane convinces him to spare Superman when the DOD facility is attacked by one of Edge's Kryptonians. Irons leaves Smallville to look