| Issue | #40 |
| Published | November 1965 |
| Cover Price | 0.12 |
| Pages | 36 |
| Editing | Julius Schwartz |
| Notes | Pencilling and inking credits per Julius Schwartz' editorial records. Inking formerly credited to Murphy Anderson and Bernard Sachs. Lettering credit from reprint in JLA Archives. |
| Characters | Superman; Hawkman [Katar Hol]; Green Lantern [Hal Jordan]; Wonder Woman; Martian Manhunter [J'onn J'onzz]; Batman |
| Genre | superhero |
| Pencils | Mike Sekowsky |
| Inks | Murphy Anderson |
| Letters | Ira Schnapp |
| Notes | Pencilling and inking credits per Julius Schwartz' editorial records. Inking formerly credited to Murphy Anderson and Bernard Sachs. Lettering credit from reprint in JLA Archives. |
| Reprinted | in Justice League of America Archives, The (DC, 1992 series) #5 |
| Characters | Aquaman; The Atom [Ray Palmer]; Batman; The Flash [Barry Allen]; Green Arrow; Green Lantern [Hal Jordan]; Hawkman [Katar Hol]; Martian Manhunter [J'onn J'onzz]; Superman; Wonder Woman (all as the Justice League of America/JLA); Mirror Master; The Shark; The Penguin; Captain Cold; Andrew Helm (villain); Chung Ka; Chandro Gopar |
| Synopsis | Andrew Helm creates a machine intended to create world peace, but which malfunctions and causes evil. The JLA traces the source of the mayhem, battles illusory creatures summoned from their subconscious minds, and turns off the malfunctioning machine. |
| Genre | superhero |
| Script | Gardner Fox |
| Pencils | Mike Sekowsky |
| Inks | Bernard Sachs |
| Letters | Gaspar Saladino |
| Notes | Lettering credit from reprint in JLA Archives. Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (May 2007). |
| Reprinted | in Justice League of America (DC, 1960 series) #115 (January-February 1975); in Justice League of America Archives, The (DC, 1992 series) #5 |
| Synopsis | Public service message teaching kids how to study. |
| Script | Jack Schiff |
| Pencils | Sheldon Moldoff |
| Inks | Sheldon Moldoff |
| Letters | Ira Schnapp |
| Script | Julius Schwartz |
| Pencils | Morris Waldinger |
| Inks | Tom Nicolosi |
| Notes | Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (May 2007). |