| Issue | #8 |
| Published | March 1965 |
| Cover Price | 0.25 USD |
| Pages | 84 |
| Editing | Jack Schiff; Julius Schwartz |
| Notes | On Sale Date - January 14th 1965 |
| Characters | Justice League of America; Wonder Woman; Green Lantern [Hal Jordan]; Batman; Green Arrow; Martian Manhunter; Aquaman; The Flash [Barry Allen]; Robin [Dick Grayson]; The Atom [Ray Palmer]; Superman; Superboy; Superbaby |
| Genre | Superhero |
| Pencils | Murphy Anderson |
| Inks | Murphy Anderson |
| Reprinted | in More Secret Origins Replica Edition (DC, 1999 series) #1 |
| Characters | Justice League of America [Wonder Woman; Green Lantern; Batman; Green Arrow; Martian Manhunter; Aquaman; The Flash; Superman; Snapper Carr] |
| Synopsis | Seven meteors are sent to Earth by aliens from the planet Appellax, six superheroes of our world individually overcome the beings that emerge from them. They then come together to combat the seventh menace and vow to form the Justice League of America. |
| Genre | Superhero |
| Script | Gardner Fox |
| Pencils | Mike Sekowsky |
| Inks | Bernard Sachs |
| Letters | Gaspar Saladino |
| Reprinted | from Justice League of America (DC, 1960 series) #9 (February-March 1962) |
| Characters | Ray Palmer; Jean Loring |
| Synopsis | Trapped in a cavern with only the tiniest escape route, scientist Ray Palmer shrinks his body and enlarges the small exit knowing that the shrinking process may kill him at any moment. |
| Genre | Superhero |
| Script | Gardner Fox |
| Pencils | Gil Kane |
| Inks | Murphy Anderson |
| Reprinted | from Showcase (DC, 1956 series) #34 (September-October 1961) |
| Synopsis | Mini biographies of legendary heroes through the ages. |
| Letters | Typeset |
| Reprinted | in More Secret Origins Replica Edition (DC, 1999 series) #1 |
| Characters | Atlantis; Aquaman [Arthur Curry] (Origin); Atlanna (Flashback); Tom Curry (Flashback); Commander Haskel |
| Synopsis | Aquaman stops the U.S. Navy from testing atomic depth charges and recounts his origin to Commander Haskel. |
| Genre | Superhero |
| Script | Robert Bernstein |
| Pencils | Ramona Fradon |
| Inks | Ramona Fradon |
| Notes | Earth 1 origin of Aquaman, substantially different from More Fun Comics version. |
| Reprinted | From Adventure Comics (DC, 1938 series) #260 (May 1959) |
| Characters | Batman; Robin [Dick Grayson]; The Flying Graysons (flashback); Sando the Strongman; Andy Sando; Limey Lou |
| Synopsis | The Dynamic Duo clear Sando the Strongman, an old friend of Robin's from his circus days, of suspicion. Along the way, The Boy Wonder recalls his origin. |
| Genre | Superhero |
| Script | Bill Finger |
| Pencils | Sheldon Moldoff |
| Inks | Charles Paris |
| Reprinted | From Batman (DC, 1940 series) #129 (February 1960) |
| Characters | The Flash [Barry Allen]; The Golden Age Flash [Jay Garrick] (in a comicbook) |
| Synopsis | Barry Allen considers operating as The Flash maskless, his musings help him to make his decision. |
| Genre | Superhero |
| Script | John Broome |
| Pencils | Carmine Infantino |
| Inks | Joe Giella |
| Reprinted | From Flash, The (DC, 1959 series) #128 (May 1962) |
| Characters | Superman (origin retold in detail); Jor-El; Zor-El; Lara; Jonathan Kent; Martha Kent; Lana Lang; Krypto; Lex Luthor (villain); Krypton; Superboy; green kryptonite; Jimmy Olsen; Lois Lane; Perry White |
| Synopsis | Recap of Superman's life from the destruction of Krypton to when he left Smallville after high school. |
| Genre | Superhero |
| Script | Otto Binder |
| Pencils | Al Plastino |
| Inks | Al Plastino |
| Reprinted | From Superman (DC, 1939 series) #146 (July 1961) |