premiere "American Alien", Otis Graves (portrayed by Robert Baker) is a member of Ben Lockwood's anti-alien activist group. Following his apparent death in the episode "Ahimsa", Otis returns in the episode "O Brother, Where Art Thou?", having been resurrected with Kryptonite and converted into a Metallo before Lockwood kills Otis. The "Metallo Procedure" itself is depicted in flashbacks in the episode "Crime and Punishment". A fifth Metallo appears in the Supergirl fourth season episode "All About Eve", portrayed by an uncredited actor. This version is an unnamed man who guards Eve Teschmacher's lab at National City University. The sixth Metallo appears in the Supergirl episode "It's a Super Life". This version is the Lena Luthor (portrayed by Katie McGrath) of an alternate universe where she never met Supergirl, suffered a failed attempt on her life carried out by Lex that left her gravely injured, and converted into a Metallo by Lillian and Cadmus. Subsequently, Lena conquered National City, with Reign and a reluctant Brainiac 5 by her side. Animation Metallo appears in The Batman two-part episode "The Batman/Superman Story", voiced by Lex Lang. This version's kryptonite heart is located where a person's actual heart would be and has a back-up power source. Metallo makes a cameo appearance in the Batman: The Brave and the Bold episode "Battle of the Superheroes!". This version resembles his Bronze Age counterpart. Metallo appears in the Justice League Action short "True Colors", voiced by Chris Diamantopoulos. Metallo makes a cameo appearance in the Harley Quinn episode "L.O.D.R.S.V.P." This version is a member of the Legion of Doom. DC Animated Universe The John Corben incarnation of Metallo appears in series set in the DC Animated Universe (DCAU): Corben first appears in Superman: The Animated Series, voiced by Malcolm McDowell. Introduced in parts two and three of the series premiere "The Last Son of Krypton", this version was originally an English criminal-for-hire. While working with Lex Luthor as part of a scheme to stage the theft of an experimental armored war suit from LexCorp and give it to the nation of Kaznia in the hopes of prompting the U.S. government to pay Luthor for another suit, Corben is eventually caught and jailed by Superman. In the episode "The Way of All Flesh", having been incarcerated in Stryker's Island, prison physician Doctor Vale seemingly discovers Corben had contracted a rare and fatal disease. Through Vale, Luthor offers to