Superman #21 (1988) - "Part 1 of the Supergirl Saga!"

 The Supergirl Saga. Part 1 of 3. "You can't Go Home Again!" Story by John Byrne. Art by John Byrne and John Beatty. Who is this new Supergirl? Where did she come from? What is the secret of her powers? And what does Lex Luthor have to do with all this? The answers are surprising, to say the least. 

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