Instagram/James Gunn Movie James Gunn confirms Lex Luthor doesn't know Superman's secret identity, and addresses a key Ultraman plot hole in the DC Universe. April 30, 2026 AceShowbiz - James Gunn, the filmmaker behind the DC Universe projects, recently addressed intriguing questions about the character of Lex Luthor and his understanding of Superman's secret identity. Fans have long speculated whether Lex Luthor is aware that Clark Kent and Superman are the same person, and Gunn provided clarity on this topic.