Superman: The Animated Series
Season 1, Episode 7
Air date September 28, 1996
Written by Stan Berkowitz
Directed by Kenji Hachizaki
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Stolen Memories

Thanks to the orchestrations of Luthor, terrorist John Corben becomes Metallo, a skin-covered cyborg with a Kryptonite heart. Luthor then sets the supervillain on a quest to kill Superman.