| Issue | #320 |
| Published | May 1964 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Mort Weisinger |
| Characters | Mon-El; Dev-Em; Superboy |
| Genre | superhero |
| Pencils | Curt Swan |
| Inks | George Klein |
| Letters | Ira Schnapp |
| Reprinted | in Legion of Super-Heroes Archives, The (DC, 1991 series) #3 |
| Characters | Legion of Super-Heroes [Superboy [also as Clark Kent]; Chameleon Boy; Mon-El; Element Lad; Saturn Girl; Lightning Lad; Sun Boy; Brainiac 5]; Dev-Em; Radiation Roy; Proty II; Krypto; Molock |
| Synopsis | Dev-Em arrives at Legion headquarters as a member of the Inter-Stellar Counter-Intelligence Corps on a mission to nab the elusive leader of the Cosmic Spy Legion, Morlock the Merciless, but loses the assignment to Superboy. |
| Genre | superhero |
| Script | Jerry Siegel; Otto Binder (pgs. 4-9) [uncredited] |
| Pencils | John Forte (pgs. 1-3, 10); George Papp (pgs. 4-9) |
| Inks | Sheldon Moldoff (pgs. 1-3, 10); George Papp (pgs. 4-9); Al Plastino (Superboy and Clark Kent faces) |
| Letters | Milton Snapinn |
| Editing | Mort Weisinger |
| Notes | Info regarding Otto Binder and reprints from Adventure Comics 287-288 by Bob Bailey, 2005-01-30 (Per Sandell ed.) |
| Reprinted | from Adventure Comics (DC, 1938 series) #287 [pgs. 4-8 only]; from Adventure Comics (DC, 1938 series) #288 [pg. 9, panels 1-2 only]; in Superboy (DC, 1949 series) #177; in Best of DC, The (DC, 1979 series) #44; in Legion of Super-Heroes Archives, The (DC, 1991 series) #3 |
| Synopsis | You shouldn't make fun of people. |
| Script | Jack Schiff |
| Pencils | Sheldon Moldoff |
| Inks | Morris Waldinger ? |
| Letters | Ira Schnapp |
| Characters | Legion of Super-Heroes [Superboy; Brainiac 5; Sun Boy; Chameleon Boy; Element Lad; Lightning Lad; Mon-El]; Dev-Em; Molock; Proty II |
| Synopsis | Superboy successfully completes Dev-Em's mission, with Proty II's help. |
| Genre | superhero |
| Script | Jerry Siegel |
| Pencils | John Forte |
| Inks | Sheldon Moldoff; Al Plastino (Superboy/Clark Kent faces only) |
| Letters | Milton Snapinn |
| Editing | Mort Weisinger |
| Reprinted | in Superboy (DC, 1949 series) #177; in Best of DC, The (DC, 1979 series) #44; in Legion of Super-Heroes Archives, The (DC, 1991 series) #3 |
| Characters | Superboy; Superman; the Kents |
| Synopsis | Superboy is projected into his future, and is replaced by Superman, who must undo it. |
| Genre | superhero |
| Script | Otto Binder ? (id by Bailey); Jerry Coleman ? (id by Bob Hughes) |
| Pencils | Curt Swan |
| Inks | John Giunta ? (id by Hughes); John Fischetti ? (id by Bailey) |
| Notes | Script suggested and pencils/inks credited by Bob Bailey, 2005-01-30 (Per Sandell ed.) |
| Reprinted | from Superboy (DC, 1949 series) #53 (December 1956) |
| Characters | Tricksy |
| Synopsis | Tricksy comes up with a stunt to get more applause. |
| Genre | gag |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Notes | humor strip |
| Letters | typeset |
| Notes | Letter column becomes Legion Outpost with this issue |