Metallo is shirtless throughout the testing of his new strength, but it is only after the train hits him that the outline of the panel concealing the Kryptonite is visible.
When Lex tells Metallo to finish Superman off, Metallo jumps and shouts. However his mouth was closed and smiling.
Clark was wearing a T-shirt and shorts, and then he appears as Superman. Where was he hiding his uniform?
Superman: We have to talk, Corben.
Metallo: Come closer. I can't hear you.
Corben: You humiliated me, Superman. Brought me in by the scruff of my neck like I was a naughty child. And now, it's my turn.
Superman: I know about Dr. Vale. It's just a matter of time before the police find them.
Lex Luthor: And what makes you think there's any of him left to find?
(Corben flashed Superman with the Kryptonite)
Corben: What's the matter, guy? You're looking a little green at the gills.
Corben: I think you are jealous of me, because now I'm the real Man of Steel.
Corben: It's all fake. A FRAUD! There's the reality! The metal behind the man! It's all I am now! It's who I am... Metallo.
Rall: Mr. Corben, I hope you don't mind me asking, but after all these months I just gotta know. How do you rate all this?
Corben: Rall, the trick is to never underestimate the value of a good friend, and always keep your mouth shut.
Corben was last seen in "The Last Son of Krypton, Part III."