Atom Man vs. Superman - 1950 Cinema Serial Ep. 02. Atom Man Appears

Atom Man vs. Superman is a 1950 American film serial and the second Superman movie serial featuring Kirk Alyn, credited (as with the previous serial) only by his character name, Superman.
When Lex Luthor blackmails the city of Metropolis by threatening to destroy the entire community, Perry White, editor of the Daily Planet assigns Lois Lane, Jimmy Olsen and Clark Kent to cover the story. The first chapter was released in July 1950.