Corrected entry: Near the end, at the Fortress of Solitude, when Lex Luthor "betrays" Superman by telling General Zod about the molecule chamber, he then tells the General "...that crystal over there activates the mechanism." How did Luthor know this? Superman did not tell him.
Gavin Jackson
21st Jun 2004
Correction: Because Lex Luthor had already been to the fortress earlier in the film and already figured out how to work the crystal activation mechanism.
Gavin Jackson