| Issue | #278 |
| Published | July 1961 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Mort Weisinger |
| Characters | Superman; Perry White (as Master-Man) |
| Genre | superhero |
| Pencils | Curt Swan |
| Inks | Stan Kaye |
| Reprinted | in Showcase Presents Superman (DC, 2005 series) #3 |
| Characters | Xasnu (villain); Superman; Perry White; Lois Lane; Masterman; Clark Kent; Jimmy Olsen; Supergirl; Y'Trom; Kandor (cameo); White Kryptonite; Fortress of Solitude; green kryptonite |
| Synopsis | After being infected by an alien plant, Perry White gains super powers and goes after Superman. |
| Genre | superhero |
| Script | Jerry Coleman |
| Pencils | Curt Swan |
| Inks | Stan Kaye |
| Reprinted | in Superman (DC, 1939 series) #227 (June-July 1970); in Showcase Presents Superman (DC, 2005 series) #3 |
| Genre | gag |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Genre | gag |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Characters | Supergirl; Superman; Krypto; Linda Lee robot; Jerro; kryptonite dust; Lori Lemaris; Tough Tommy |
| Synopsis | Superman is ready to announce Supergirl's existence to the world, but she mysteriously loses her powers at the last minute. |
| Genre | superhero |
| Script | Jerry Siegel (writer id by Bob Hughes) |
| Pencils | Jim Mooney |
| Inks | Jim Mooney |
| Notes | Serialized story (vs. Lesla Lar) which continues until 285. Story is also claimed by Otto Binder. |
| Reprinted | in Action Comics (DC, 1938 series) #360 (March 1968); in Supergirl Archives (DC, 2001 series) #2; in Showcase Presents: Supergirl (DC, 2007 series) #1 |
| Genre | gag |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Notes | Title, first line and reprint data from Arthur Lortie, added August 2006. |
| Reprinted | from Action Comics (1938 series) #249 (DC, 1959) |