Written by Jerry Siegel and Robert Bernstein, Art by Jim Mooney and Wayne Boring. Cover by Jim Mooney.

Featuring stories from Action Comics #286-302. 224 pages.

In this third volume of her adventures, the Maid of Steel finds that being known to the world is a mixed blessing. Lex Luthor immediately decides to test her mettle, in her first clash with Superman's arch-enemy. Then, aided by Mon-El, she must thwart a plot by Phantom Zone villain Jax-Ur. Finally, in a 4-part story, Supergirl meets Lena Thorul, Luthor's sister, and with some aid from Luthor himself, battles the likes of Kandorian villainess Lesla-Lar and an assortment of Phantom Zone escapees! Also in this volume: the origin of Comet the Super-Horse, and the first appearance of the Supergirl Emergency Squad!