| 0 | - | cover | 1 | colors: Tom McCraw | |
| 1 | Introduction | foreword, introduction, preface, afterword | 6 | script: Paul Kupperberg | |
| 2 | - | cover reprint (on interior page) | 1 | pencils: John Prentice; inks: John Prentice | |
| 3 | The Story Behind Showcase | comic story | 1 | script: Jack Schiff; pencils: Win Mortimer; inks: Win Mortimer | |
| 4 | The School for Smoke-Eaters | comic story | 8 | script: Arnold Drake; pencils: John Prentice; inks: John Prentice | |
| 5 | Fire Under the Big Top | comic story | 8 | script: Arnold Drake; pencils: John Prentice; inks: John Prentice | |
| 6 | Fourth Alarm | comic story | 8 | script: Arnold Drake; pencils: John Prentice; inks: John Prentice | |
| 7 | - | cover reprint (on interior page) | 1 | pencils: Carmine Infantino; inks: Joe Kubert | |
| 8 | Mystery of the Human Thunderbolt! | comic story | 12 | script: Robert Kanigher; pencils: Carmine Infantino; inks: Joe Kubert | Flash [Barry Allen] (first appearance, origin); Flash [Jay Garrick] (on a comic book cover); Iris West (first appearance); The Turtle Man [later The Turtle] (villain) |
| 9 | The Man Who Broke the Time Barrier! | comic story | 10 | script: John Broome; pencils: Carmine Infantino; inks: Joe Kubert | Flash [Barry Allen]; Mazdan (villain) |
| 10 | - | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Jack Kirby | |
| 11 | The Secret of the Sorcerer's Box! | comic story | 24 | script: Jack Kirby, Dave Wood; pencils: Jack Kirby; inks: Roz Kirby; letters: Ben Oda | Challengers of the Unknown [Ace Morgan; Prof Haley; Red Ryan; Rocky Davis] (first appearance, origin); sailors; citizens; VILLAIN: Mr. Morelian (first appearance; dies) |
| 12 | Superman's Girl Friend, Lois Lane | cover reprint (on interior page) | 1 | pencils: Al Plastino; inks: Al Plastino | |
| 13 | The Girl in Superman's Past | comic story | 8 | script: Jerry Coleman; pencils: Al Plastino; inks: Al Plastino | Lois Lane; Lana Lang; Superman [Clark Kent] |
| 14 | The New Lois Lane | comic story | 8 | script: Otto Binder; pencils: Ruben Moreira; inks: Al Plastino | Superman [Clark Kent]; Lois Lane; Conners [Con] |
| 15 | Mrs. Superman | comic story | 8 | script: Otto Binder; pencils: Al Plastino; inks: Al Plastino | Superman; Jimmy Olsen; Lulu Lyons (introduction) |
| 16 | - | cover reprint (on interior page) | 1 | pencils: Jack Kirby; inks: Jack Kirby | |
| 17 | The Day the Earth Blew Up | comic story | 24 | script: David Wood; pencils: Jack Kirby; inks: Bruno Premiani | Challengers of the Unknown [Ace Morgan; Rocky Davis; Professor Haley; Red Ryan]; Carl Jackson; Warren Moss; Commander Lockwood; Colonel Price. Villains: General Tolek; Garnat; other Tyrans |
| 18 | - | cover reprint (on interior page) | 1 | pencils: Carmine Infantino; inks: Frank Giacoia | |
| 19 | Around the World in 80 Minutes! | comic story | 13.5 | script: Robert Kanigher; pencils: Carmine Infantino; inks: Joe Giella | Flash [Barry Allen]; Iris West; Le Chat Noir (villain); El Claw (villain); Princess Tara |
| 20 | Master of the Elements! | comic story | 12 | script: John Broome; pencils: Carmine Infantino; inks: Frank Giacoia | Flash [Barry Allen]; Iris West; Mr. Element [Albert Desmond; later Dr. Alchemy] (first appearance, origin, villain); Argon (villain); Radon (villain); Krypton (villain); Xenon (villain) |
| 21 | - | cover reprint (on interior page) | 1 | pencils: Gil Kane; inks: Gil Kane | |
| 22 | Secret of the Eternal City! | comic story | 14.33 | script: Gardner Fox, Edmond Hamilton; pencils: Mike Sekowsky; inks: Frank Giacoia, Joe Giella | Adam Strange (introduction, origin); Rann (planet, introduction) |
| 23 | The Planet and the Pendulum! | comic story | 9.5 | script: Gardner Fox, Edmond Hamilton; pencils: Mike Sekowsky; inks: Frank Giacoia, Joe Giella | |
| 24 | - | cover reprint (on interior page) | 0.25 | pencils: Irv Novick; inks: Irv Novick | |
| 25 | - | cover reprint (on interior page) | 0.25 | pencils: Ruben Moreira; inks: Ruben Moreira | |
| 26 | Frogmen | cover reprint (on interior page) | 0.25 | pencils: Russ Heath; inks: Russ Heath | |
| 27 | - | cover reprint (on interior page) | 0.25 | pencils: Jack Kirby; inks: Jack Kirby | |
| 28 | - | cover reprint (on interior page) | 0.33 | pencils: Jack Kirby; inks: Jack Kirby | |
| 29 | Superman's Girl Friend, Lois Lane | cover reprint (on interior page) | 0.33 | pencils: Wayne Boring; inks: Stan Kaye | |
| 30 | - | cover reprint (on interior page) | 0.33 | pencils: Carmine Infantino; inks: Frank Giacoia | |
| 31 | - | cover reprint (on interior page) | 0.33 | pencils: Carmine Infantino; inks: Frank Giacoia | |
| 32 | Space Ranger | cover reprint (on interior page) | 0.33 | pencils: Bob Brown; inks: Bob Brown | |
| 33 | Space Ranger | cover reprint (on interior page) | 0.33 | pencils: Bob Brown; inks: Bob Brown | |
| 34 | - | cover reprint (on interior page) | 0.25 | pencils: Gil Kane; inks: Frank Giacoia | |
| 35 | - | cover reprint (on interior page) | 0.25 | pencils: Gil Kane; inks: Gil Kane | |
| 36 | Rip Hunter...Time Master | cover reprint (on interior page) | 0.25 | pencils: Bob Brown; inks: Bob Brown | |
| 37 | Rip Hunter...Time Master | cover reprint (on interior page) | 0.25 | pencils: Mike Sekowsky; inks: Joe Giella | |