The Big Scoop Superman : Season 1 Episode 9

Clark Kent's old friend Dr. Glozer invents the Chronotron which allows the user to see into the future. Lex Luthor wants the device and sends his men to capture Dr. Glozer and steal the machine. Using it to win at horse racing, Luthor sees a crime at the track and realizes Clark Kent is Superman. Luthor then gets Clark on a tabloid TV show to force him to reveal himself.