Regan Matthews was a LuthorCorp executive who worked closely with Lex Luthor while he was investigating the Veritas Society. When Tess Mercer took control over LuthorCorp in Summer of 2008, Regan went missing after he had temporary control and instead began working secretly with Lex Luthor on a new project called Prometheus. Regan Matthews didn't like Tess Mercer; in fact he seemed to get annoyed or angry whenever they were together.