| Issue | #251 |
| Published | April 1959 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Mort Weisinger |
| Characters | Superman |
| Genre | superhero |
| Pencils | Curt Swan |
| Inks | Stan Kaye |
| Reprinted | in Showcase Presents Superman (DC, 2005 series) #1 |
| Characters | Superman; Prof. Vance; Fortress of Solitude; Perry White; Lois Lane; Jimmy Olsen; Superman robot; The Clock (villain) |
| Synopsis | When Clark Kent drinks Prof. Vance's life-extending vitamin serum, which contains particles of Kryptonite, it ages him to about 70 years old. Since his robots won't respond to his aged voice, Superman must fulfill his duties as the Old Man of the Sea, Santa Claus, and Father Time so that no one realizes that Clark Kent is Superman. |
| Genre | superhero |
| Script | Robert Bernstein |
| Pencils | Al Plastino |
| Inks | Al Plastino |
| Reprinted | in Superman Annual (1960 series) #3 (Summer 1961); in Showcase Presents Superman (DC, 2005 series) #1 |
| Genre | fact |
| Script | Jack Schiff |
| Pencils | Bernard Baily |
| Inks | Bernard Baily |
| Letters | Ira Schapp |
| Characters | Superman; Supergirl |
| Genre | superhero |
| Script | Mort Weisinger |
| Pencils | Al Plastino |
| Inks | Al Plastino |
| Notes | Full page ad introducing the Supergirl strip which is to start next issue. |
| Characters | Congorilla; Congo Bill; Janu the Jungle Boy; Corliss Hyde (villain) |
| Synopsis | Murderer Corliss Hyde hijacks a passenger plane, which crashes into the jungle. Congo Bill, as Congorilla, saves the crew, but not before Hyde realizes that there's an intelligent mind directing the gorilla. Using gas grenades, he puts Congorilla to sleep, and fits him with an explosive collar, forcing him to commit crimes. |
| Genre | superhero; jungle |
| Script | Robert Bernstein |
| Pencils | Howard Sherman |
| Inks | Howard Sherman |
| Script | Mort Weisinger |
| Pencils | Wayne Boring |
| Inks | Stan Kaye |
| Letters | typeset |
| Notes | Includes an announcement that Tommy Tomorrow will be relocating to World's Finest Comics and that Supergirl will be joining the Action lineup. Also, an interesting question from a reader wondering whatever became of the character Captain Marvel. |
| Genre | teen; humor |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Notes | Secret message and application form. |
| Characters | Tommy Tomorrow; Brent Wood |
| Synopsis | Tommy and the Planeteers battle a giant space amoeba. |
| Genre | science fiction |
| Script | Otto Binder |
| Pencils | Jim Mooney |
| Inks | Jim Mooney |
| Notes | Tommy next appears in WORLD'S FINEST #102 (June 1959), replacing Tomahawk. |