Destruction Inc. (1942)
Lois Lane: Well, Pop, Superman put an end to their little act.
[she removes his disguise]
Lois Lane: And this puts an end to yours, Clark Kent.
Voices: Up in the sky, look! It's a bird! It's a plane! It's Superman!
Narrator: Faster than a streak of lightning! More powerful than the pounding surf! Mightier than a roaring hurricane! This amazing stranger from the planet Krypton, The Man of Steel: Superman! Possessing remarkable physical strength, Superman fights a never-ending battle for truth and justice, disguised as a mild-mannered newspaper reporter, Clark Kent.