Superman's Girl Friend, Lois Lane #21

High above a city skyline, Super-Lois and Super-Lana clash mid-air — both in caped costumes bearing their initials — while a wide-eyed Superman reaches up between them, pleading for them to stop. The cover of Superman's Girl Friend, Lois Lane #21 (November 1960) promises "The Battle Between Super-Lois and Super-Lana!", and the speech bubbles make the stakes delightfully clear: both women have gained permanent super-powers and each is making her case to be Superman's wife. Penciled by Curt Swan and inked by Stan Kaye and Kurt Schaffenberger, it's a wonderfully energetic Silver Age cover that captures the playful rivalry at the heart of this series.