| 0 | - | cover | 1 | pencils: Curt Swan; inks: Stan Kaye; colors: Drew Moore | Superman; Supergirl |
| 1 | Showcase Presents: Supergirl Volume One | credits, title page | 4 | letters: typeset | |
| 2 | Superman #123 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman; Super-Girl |
| 3 | The Three Magic Wishes: The Girl of Steel (Part 1) | comic story | 10 | script: Otto Binder; pencils: Dick Sprang; inks: Stan Kaye | Super-Girl (Introduction; Death; a magically-created female partner for Superman); Superman; Lois Lane; Jimmy Olsen |
| 4 | The Three Magic Wishes: The Lost Super-Powers (Part 2) | comic story | 6 | script: Otto Binder; pencils: Dick Sprang; inks: Stan Kaye | Superman; Jimmy Olsen |
| 5 | The Three Magic Wishes: Superman's Return to Kypton (Part 3) | comic story | 10 | script: Otto Binder; pencils: Dick Sprang; inks: Stan Kaye | Superman; Jimmy Olsen; Jor-El; Lara; Kil-Lor (Intro, Death) |
| 6 | Introducing the Girl of Steel | promo (ad from the publisher) | 1 | pencils: Al Plastino; inks: Al Plastino | Superman; Supergirl |
| 7 | Action Comics #252 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Al Plastino | Superman; Supergirl |
| 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 | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl (brief origin); Miss Hart; Superman (flashback, in newsreel footage); Zor-El (flashback); Timmy Tate |
| 10 | Supergirl's Foster Parents! | comic story | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; 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; Tommy Tomorrow (as a child); Jik |
| 12 | The Great Supergirl Mirage! | comic story | 7 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl; Dick Wilson [later Dick Malverne]; Supergirl Robot |
| 13 | Jimmy Olsen, Supergirl's Pal! | comic story | 9 | script: Otto Binder; pencils: Curt Swan; inks: George Klein | Supergirl [Kara Zor-El]; Jimmy Olsen; Superman; Colonel Colby; Thora; Zor-El (flashback; cameo) |
| 14 | The Three Magic Wishes! | comic story | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Tim Baxter; Peggy |
| 15 | Action Comics #258 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman; Supergirl [Kara Zor-El] |
| 16 | Supergirl's Farewell to Earth! | comic story | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Krypto; Superman |
| 17 | The Cave-Girl of Steel! | comic story | 7 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Superman (cameo) |
| 18 | Lois Lane's Secret Romance! | comic story | 9 | script: Jerry Siegel; pencils: Kurt Schaffenberger; inks: Kurt Schaffenberger | Lois Lane; Supergirl [Kara Zor-El]; Superman |
| 19 | Action Comics #260 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman [Clark Kent]; Supergirl [Kara Zor-El] (as a Superbaby and as Mighty Maid); Lois Lane; Perry White |
| 20 | Mighty Maid! | comic story | 12 | script: Otto Binder; pencils: Al Plastino; inks: Al Plastino | Superman; Supergirl [Kara Zor-El] [as Mighty Maid]; Lois Lane; Perry White |
| 21 | The Girl Superbaby! | comic story | 8 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Julu the Elder; Mojax; Superman |
| 22 | Supergirl's Super Pet! | comic story | 8 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Streaky |
| 23 | Action Comics #262 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman [Clark Kent]; Supergirl [Kara Zor-El] |
| 24 | Supergirl's Greatest Victory! | comic story | 12 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El] (origin recap); Superman [Clark Kent]; Zor-El (flashback); Allura (unnamed, flashback); Metal-eater beast |
| 25 | Superboy #80 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superboy; Supergirl [Kara Zor-El] |
| 26 | Superboy Meets Supergirl! | comic story | 9 | script: Jerry Siegel; pencils: Curt Swan; inks: John Forte | Superboy; Supergirl [Kara Zor-El]; Superman; Zor-El (flashback) |
| 27 | Supergirl's Darkest Day! | comic story | 12 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Valzorr [Johnny Blank]; Zoxxo |
| 28 | Supergirl Gets Adopted! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Mr. Wilkins; Mrs. Wilkins |
| 29 | Action Comics #265 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman [Clark Kent]; Supergirl [Kara Zor-El] |
| 30 | The Day Supergirl Revealed Herself! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Mary Jane; Superman; Supergirl robot; Mr. and Mrs. Evans |
| 31 | Superman's Pal, Jimmy Olsen #46 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Jimmy Olsen; Supergirl [Kara Zor-El]; Superman |
| 32 | Jimmy Olsen, Orphan! | comic story | 9 | script: Jerry Siegel; pencils: Curt Swan; inks: John Forte | Jimmy Olsen; Supergirl [Kara Zor-El]; Perry White; Superman |
| 33 | Action Comics #266 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman; Supergirl [Kara Zor-El]; Krypto; Streaky |
| 34 | The World's Mightiest Cat! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Streaky; Superman; Krypto; Paul Dexter |
| 35 | The Untold Story of Red Kryptonite! | comic story | 9 | script: Otto Binder; pencils: Curt Swan; inks: John Forte | Superman [Clark Kent]; Supergirl [Kara Zor-El]; Krypto; Superboy [Clark Kent](flashback); Kozz (flashback); Jonathan Kent (flashback; cameo); Martha Kent (flashback; cameo); Lois Lane; Jimmy Olsen; Perry White; Superman Robot |
| 36 | The Three Super-Heroes! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: Joe Letterese | Supergirl [Kara Zor-El]; Legion of Super-Heroes [Cosmic Boy; Lightning Lad; Saturn Girl; Chameleon Boy; Colossal Boy; Invisible Kid]; Superman |
| 37 | The Mystery Supergirl! | comic story | 13 | script: Otto Binder, Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Suprgirl [Kara Zor-El]; Perry White; Superman (flashback and a cameo as Clark Kent); five fake Supergirls; Billy Watkins; Bob Carter |
| 38 | The Son of Bizarro! [Part 1] | comic story | 10 | script: Otto Binder; pencils: Wayne Boring; inks: Stan Kaye | Superman; Bizarro #1; Bizarro-Lois #1; Bizarro-Jr. #1 (born); Bizarro World; Lex Luthor (flashback); Lois Lane (flashback) |
| 39 | The "Orphan" Bizarro! [Part 2] | comic story | 8 | script: Otto Binder; pencils: Wayne Boring; inks: Stan Kaye | Superman; Bizarro-Jr. #1; Supergirl [Kara Zor-El]; Krypto; Bizarro #1; Bizarro-Lois #1 |
| 40 | The Bizarro Supergirl! [Part 3] | comic story | 8 | script: Otto Binder; pencils: Wayne Boring; inks: Stan Kaye | Superman; Bizarro-Supergirl (intro); Supergirl [Kara Zor-El]; Bizarro-Jr. #1; Krypto; Bizarro-Lois #1; Bizarro #1 |
| 41 | Supergirl's First Romance! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Jerro the Merboy (intro); Lori Lemaris; Ronal; Superman (statue); Freddy Blake |
| 42 | Action Comic #270 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman; Lois Lane; Supergirl [Kara Zor-El] |
| 43 | The Old Man of Metropolis | comic story | 10 | script: Otto Binder; pencils: Curt Swan; inks: John Forte | Superman [Clark Kent]; Lois Lane; Jimmy Olsen; Perry White; Supergirl [Kara Zor-El] (also as Superwoman); Lucy Lane; Lex Luthor; Krypto; Lana Lang; Bizarro |
| 44 | Supergirl's Busiest Day! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Batman (guest star); Robin (guest star); Krypto; Lori Lemaris; Superman; Ronal; Jerro; Malo (villain); Joker (picture); Krypto |
| 45 | Adventure Comics #278 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye; letters: Ira Schnapp | Supergirl [Kara Zor-El]; Superboy robot; Martha Kent; Jonathan Kent |
| 46 | Supergirl in Smallville! | comic story | 12 | script: Otto Binder; pencils: Al Plastino; inks: Al Plastino | Supergirl [Kara Zor-El]; Krypto; Martha Kent; Jonathan Kent; Lana Lang; Linda Lee robot |
| 47 | Supergirl's Fortress of Solitude! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Superman; Supergirl [Kara Zor-El]; Streaky; Jerro (statue); Lori Lemaris (statue); Ronal (statue); Professor Damon Brant (villain); Mrs. Brant (villain); Mrs. Hart |
| 48 | The Second Supergirl! | comic story | 13 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Marvel Maid (origin); Marvel Man (origin); Superman |
| 49 | The Supergirl of Two Worlds! | comic story | 13 | script: Otto Binder; pencils: Jim Mooney; inks: Jim Mooney | Superman; Supergirl [Kara Zor-El]; Marvel Maid; Marvel Man; Lex Luthor (etching of face); Krypto (statue); Superman Robots; Supergirl Robots |
| 50 | Pick a New Hair Style for Linda (Supergirl) Lee! | illustration | 1 | pencils: Jim Mooney; inks: Jim Mooney | Linda Lee [Supergirl]; Streaky |
| 51 | The Girl with Green Hair! | comic story | 9 | script: Otto Binder; pencils: Curt Swan; inks: John Forte | Jimmy Olsen; Supergirl [Kara Zor-El]; Lucy Lane; Lois Lane; Ricky Avalon; Professor Potter |
| 52 | Supergirl's Three Time Trips! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Annie Oakley; Buffalo Bill; George Washington; Betsy Ross; Captain John Smith; Running Deer; Pocahontas; Superman |
| 53 | Superman #144 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman; Supergirl [Kara Zor-El]; Krypto |
| 54 | The Orphans of Space! | comic story | 8 | script: Jerry Siegel; pencils: Al Plastino; inks: Al Plastino | Superman [Clark Kent]; Supergirl [Kara Zor-El]; Krypto; Interstellar Council of United Planets [Zog] |
| 55 | Ma and Pa Kent Adopt Supergirl! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Jonathan Kent; Martha Kent; Superman; Lex Luthor; Bob Benson; Squawky the Super-Parrot; Jor-El (cameo); Lara (cameo); Lana Lang (cameo) |
| 56 | Action Comics #276 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman Emergency Squad; Supergirl [Kara Zor-El] |
| 57 | The War Between Supergirl and the Supermen Emergency Squad! | comic story | 14 | script: Robert Bernstein; pencils: Wayne Boring; inks: Stan Kaye | Superman; Supergirl [Kara Zor-El]; The Supermen Emergency Squad; Lois Lane; The Anti-Superman Gang; John Kiley |
| 58 | Supergirl's Three Super Girl-Friends! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; 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; Je |
| 59 | Action Comics #277 | cover reprint (on interior page) | 1 | pencils: Curt Swan; inks: Stan Kaye | Superman; Supergirl [Kara Zor-El]; Krypto; Streaky |
| 60 | The Battle of the Super-Pets! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Streaky; Krypto; Superman; Mr. Mxyzptlk (image); The Interplanetary Multi-Dimensional Practical Jokers Club; Super-Monkey (cameo) |
| 61 | The Unknown Supergirl! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Superman; Krypto; Linda Lee robot; Jerro; Lori Lemaris; Tough Tommy |
| 62 | Supergirl's Secret Enemy! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Lesla-Lar (villain); Lori Lemaris (picture); Ronal (picture); Superman; Fred Danvers (intro); Mrs. Danvers (intro); Streaky; Jor-El (statue); Brainiac (picture); Lex Luthor |
| 63 | Trapped in Kandor! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El] (brief origin); Superman; Lex Luthor; Lesla-Lar (villain); Fred Danvers; Mrs. Danvers; Zor-El (flashback); Perry White (cameo); Ma Kent (flashback; cameo); Pa Kent (flashback; cameo) |
| 64 | The Secret of the Time-Barrier! | comic story | 12 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; Superman; Krypto; Lesla-Lar (villain) |
| 65 | - | activity | 1 | pencils: Jim Mooney | Linda Lee [Supergirl] |
| 66 | The Supergirl of Tomorrow! | comic story | 13 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney | Supergirl [Kara Zor-El]; 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) |