| Issue | #240 |
| Published | September 1957 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Whitney Ellsworth (credited); Jack Schiff (Managing Editor), Mort Weisinger (story editor); George Kashdan (story editor) |
| Characters | Robot Teacher |
| Genre | superhero |
| Pencils | Curt Swan |
| Inks | Stan Kaye |
| Characters | Jor-El and Lara(flashback); Robot Teacher; Lana Lang; Ma Kent |
| Synopsis | A robot teacher constructed by Jor-El comes to Earth to decide if Superboy is worthy of his powers. |
| Genre | superhero |
| Script | Edmond Hamilton |
| Pencils | John Sikela |
| Inks | John Sikela |
| Reprinted | in Superman Annual (DC, 1960 series) #5 (Summer 1962); in DC Super Stars (DC, 1976 series) #12 (February 1977) |
| Genre | fact |
| Script | Jack Schiff |
| Pencils | Ruben Moreira |
| Inks | Ruben Moreira |
| Letters | Ira Schnapp |
| Characters | Arrow Cave |
| Synopsis | Oliver's investments go bad, so Green Arrow and Speedy have to earn money to pay the mortgage on the Arrow Cave |
| Genre | superhero |
| Pencils | George Papp |
| Inks | George Papp |
| Reprinted | in Big Boy (Artima, 1956 series) #18 |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Genre | fact |
| Letters | typeset |
| Genre | superhero |
| Pencils | Ramona Fradon |
| Inks | Ramona Fradon |