| 0 | - | cover | 1 | pencils: Michael Cho; inks: Michael Cho | Supergirl [Kara Zor-El] |
| 1 | Title Page | credits, title page | 1 | pencils: Michael Cho; inks: Michael Cho | Supergirl [Kara Zor-El] |
| 2 | Creator Credits | credits, title page | 1 | | |
| 3 | Second Title Page | credits, title page | 1 | pencils: Michael Cho; inks: Michael Cho | Supergirl [Kara Zor-El] |
| 4 | Indicia and Publisher Information | credits, title page | 1 | letters: typeset | |
| 5 | Table of Contents | table of contents | 2 | letters: typeset | |
| 6 | Introducing the Girl of Steel | promo (ad from the publisher) | 1 | script: Mort Weisinger; pencils: Al Plastino; inks: Al Plastino; letters: Ira Schnapp | Superman; Supergirl |
| 7 | Action Comics #252 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Al Plastino | Superman [Kal-El]; Supergirl [Kara Zor-El] |
| 8 | The Supergirl from Krypton! | comic story | 7.67 | script: Otto Binder; pencils: Al Plastino; inks: Al Plastino | Superman [Kal-El]; Supergirl [Kara Zor-El] (introduction, origin); Zor-El (introduction, flashback); Miss Hart (introduction); Superboy (on a poster) |
| 9 | The Secret of the Super-Orphan! | comic story | 7.67 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl (brief origin); Miss Hart; Timmy Tate; Superman (flashback, in newsreel footage); Zor-El (flashback); Alura (flashback) |
| 10 | Supergirl's Foster Parents! | comic story | 7.67 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Lee]; Miss Hart; Mr. Dale (villain); Mrs. Dale (villain) |
| 11 | Supergirl Visits the 21st Century! | comic story | 6.67 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El; Linda Lee]; Superman (behind-the-scenes); Tommy Tomorrow (as a child, earliest chronological appearance); Mr. Tomorrow (introduction); Mrs. Tomorrow (introduction); Jik of Mars |
| 12 | The Great Supergirl Mirage! | comic story | 6.67 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Lee]; Dick Wilson [later Dick Malverne]; Supergirl Robot |
| 13 | The Three Magic Wishes! | comic story | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El; Linda Lee]; Tom Baxter; Peggy |
| 14 | Action Comics #258 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman [Clark Kent]; Supergirl [Kara Zor-El] |
| 15 | Supergirl's Farewell to Earth! | comic story | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Lee]; Krypto; Superman [Clark Kent] |
| 16 | The Cave-Girl of Steel! | comic story | 7 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El; Linda Lee]; Superman (cameo) |
| 17 | The Girl Superbaby! | comic story | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Lee]; Julu the Elder; Mojax; Superman [Clark Kent] |
| 18 | Supergirl's Super Pet! | comic story | 8 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Linda Lee]; Streaky the Super-Cat (introduction); Miss Hart |
| 19 | Action Comics #262 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye; letters: Ira Schnapp | Superman [Clark Kent]; Supergirl [Kara Zor-El] |
| 20 | Supergirl's Greatest Victory! | comic story | 12 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Kara Zor-El] (origin recap); Superman [Clark Kent]; Miss Hart; Zor-El (flashback); Alura (unnamed, flashback) |
| 21 | Supergirl's Darkest Day! | comic story | 12 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Linda Lee]; Johnny Blank [Prince Valzorr]; Zoxxo; Miss Hart (cameo) |
| 22 | Supergirl Gets Adopted! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Linda Lee]; Mr. Wilkins; Mrs. Wilkins; Miss Hart |
| 23 | Action Comics #265 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman [Clark Kent]; Supergirl [Kara Zor-El] |
| 24 | The Day Supergirl Revealed Herself! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Mary Jane; Superman; Supergirl robot; Mr. Evans; Mrs. Evans |
| 25 | Action Comics #266 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye; letters: Ira Schnapp | Superman [Clark Kent]; Supergirl [Kara Zor-El]; Streaky; Krypto |
| 26 | The World's Mightiest Cat! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Joe Letterese | Supergirl [Kara Zor-El; Linda Lee]; Streaky; Superman; Krypto; Paul Dexter |
| 27 | The Three Super-Heroes! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Joe Letterese | Supergirl; Legion of Super-Heroes [Cosmic Boy; Lightning Lad; Saturn Girl; Chameleon Boy; Colossal Boy; Invisible Kid]; Superman |
| 28 | The Mystery Supergirl! | comic story | 13 | script: Otto Binder, Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Suprgirl; Perry White; Superman (flashback and a cameo as Clark Kent); five fake Supergirls; Billy Watkins; Bob Carter |
| 29 | Supergirl's First Romance! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Jerro the Merboy (intro); Lori Lemaris; Ronal; Superman (statue); Freddy Blake |
| 30 | Supergirl's Busiest Day! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Batman (guest star); Robin (guest star); Krypto; Lori Lemaris; Superman; Ronal; Jerro; Malo (villain); Joker (picture); Krypto |
| 31 | Supergirl's Fortress of Solitude! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Superman; Supergirl; Streaky; Jerro (statue); Lori Lemaris (statue); Ronal (statue); Professor Damon Brant (villain); Mrs. Brant (villain); Mrs. Hart |
| 32 | The Second Supergirl! | comic story | 13 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Linda Lee]; Marvel Maid [Lea Lindy] (origin); Marvel Man [Ken Clark] (origin); Superman |
| 33 | The Supergirl of Two Worlds! | comic story | 13 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Linda Lee]; Superman [Clark Kent]; Marvel Maid [Lea Lindy]; Marvel Man [Ken Clark]; Lex Luthor (etching of face); Krypto (statue); Superman Robots; Supergirl Robots |
| 34 | Pick a New Hair Style for Linda (Supergirl) Lee! | activity | 1 | pencils: Jim Mooney; inks: Jim Mooney | Linda Lee [Supergirl] |
| 35 | Supergirl's Three Time Trips! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl; Annie Oakley; Buffalo Bill; George Washington; Betsy Ross; Captain John Smith; Running Deer; Pocahontas; Superman |
| 36 | Ma and Pa Kent Adopt Supergirl! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Jonathan Kent; Martha Kent; Superman; Lex Luthor; Bob Benson; Squawky the Super-Parrot; Jor-El (cameo); Lara (cameo); Lana Lang (cameo) |
| 37 | Supergirl's Three Super Girl-Friends! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Lee]; Legion of Super-Heroes [Saturn Girl; Phantom Girl (intro); Triplicate Girl (intro, later Duo Damsel); Cosmic Boy; Lightning Lad; Shrinking Violet (intro); Bouncing Boy (intro); Sun Boy (intro); Brainiac 5 (intro)]; Brainiac (flashback); Superman (flashback); Lori Lemaris; Jerr |
| 38 | Action Comics #277 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman; Supergirl; Streaky; Krypto |
| 39 | The Battle of the Super-Pets! | comic story | 11.67 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Streaky; Krypto; Superman; Mr. Mxyzptlk (image); The Interplanetary Multi-Dimensional Practical Jokers Club; Super-Monkey (cameo) |
| 40 | The Unknown Supergirl! | comic story | 12.67 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Lee]; Superman; Krypto; Linda Lee robot; Jerro; Lori Lemaris; Tough Tommy |
| 41 | Supergirl's Secret Enemy! | comic story | 11.67 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Danvers]; Lesla-Lar (villain); Superman [Clark Kent]; Fred Danvers (introduction); Edna Danvers (introduction); Lex Luthor; Streaky; Lori Lemaris (picture); Ronal (picture); Jor-El (statue); Brainiac (picture); unnamed Kandorian scientist (condemned to the Phantom Zone) |
| 42 | Trapped In Kandor! | comic story | 11.67 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Linda Danvers] (brief origin); Superman [Clark Kent]; Lex Luthor; Lesla-Lar (villain); Fred Danvers; Edna Danvers; Zor-El (flashback); Perry White (cameo); Martha Kent (flashback; cameo); Jonathan Kent (flashback; cameo) |
| 43 | The Secret of the Time-Barrier! | comic story | 11.67 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Superman; Krypto; Lesla-Lar (villain) |
| 44 | Did You Vote for a New Hair Style for Linda (Supergirl) Lee? | illustration | 1 | pencils: Jim Mooney; inks: Jim Mooney | Linda Lee; Streaky |
| 45 | The Supergirl of Tomorrow! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Superman; Lesla-Lar (villain); Gismak-Ral; Dick Malverne [was Dick Wilson]; Mr. Mxyzptlk; Lex Luthor; Fred Danvers; Mrs. Danvers; Angark; Jerro (flashback); Brainiac 5 (flashback) |
| 46 | The Six Red "K" Perils of Supergirl! | comic story | 12.67 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Linda Danvers]; Mr. Mxyzptlk; Fred Danvers; Mrs. Danvers; Superman [Clark Kent]; Dick Malverne; Rolf Von Holtz; Conway Tremaine |
| 47 | The Strange Bodies of Supergirl! | comic story | 11.67 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Milt Snapinn | Supergirl [Linda Danvers]; Krypto; Jerro; Lenora Lemaris; Lori Lemaris; Superman; Fred Danvers; Edna Danvers |
| 48 | Complete Your Collection With These Other Golden and Silver Age Trade Paperbacks | promo (ad from the publisher) | 2 | pencils: Michael Cho; inks: Michael Cho | |
| 49 | Title Page | credits, title page | 1 | | |
| 50 | Introducing the Girl of Steel | illustration | 1 | pencils: Jim Mooney, Curt Swan; inks: Jim Mooney, Al Plastino, Stan Kaye | Supergirl [Kara Zor-El]; Jerro the Merboy; Lesla-Lar; Krypto; Superman [Clark Kent]; Brainiac 5; Mr. Mxyzptlk; Streaky |