| Issue | #147 |
| Published | May-June 1968 |
| Frequency | monthly, with the exception of Feb., Aug., and Nov. |
| Cover Price | 0.25 USD |
| Pages | 84 |
| Editing | Mort Weisinger |
| Notes | Also numbered as 80 Page Giant #G-47. |
| Characters | Legion of Super-Heroes [Superboy; Supergirl; Lightning Lad; Saturn Girl; Cosmic Boy; Ultra Boy; Brainiac 5; Sun Boy; Triplicate Girl; Phantom Girl]; Krypto; Streaky |
| Genre | superhero |
| Pencils | Curt Swan |
| Inks | Neal Adams |
| Letters | Gaspar Saladino |
| Reprinted | in Legion of Super-Heroes Archives, The (DC, 1991 series) #8 (1998); in Superboy #147 May-June 1968 Replica Edition (DC, 2003 series) #[nn] [reinked, minus the price and the G-47 number] |
| Characters | Legion of Super-Heroes [Lightning Lad; Cosmic Boy; Saturn Girl; Supergirl; Sun Boy; Superboy; Phantom Girl; Light Lass; Triplicate Girl; Ultra Boy; Chameleon Boy; Brainiac 5; Shrinking Violet; Element Lad; Colossal Boy; Mon-El] (origin); R.J. Brande; Lightning Lord [as Mekt Ranzz] |
| Synopsis | Three youths with fantastic powers save billionaire R.J. Brande, who bankrolls them in an organization meant to emulate Superboy and Supergirl, the Legion of Super-Heroes. |
| Genre | Superhero |
| Script | E. Nelson Bridwell |
| Pencils | Pete Costanza |
| Inks | Pete Costanza |
| Letters | Milt Snapinn |
| Reprinted | in Secret Origins (DC, 1973 series) #6 (January-February 1974); in Legion of Super-Heroes Archives, The (DC, 1991 series) #8 (1998); in Superboy #147 May-June 1968 Replica Edition (DC, 2003 series) #[nn] |
| Characters | Superboy [also appears as Clark Kent]; Ultra Boy [Jo Nah; "Gary Crane"]; Marla ["Ben Crane"]; Pete Ross; Krypto; Lana Lang; Martha Kent; Jonathan Kent |
| Synopsis | Ultra Boy must discover Superboy's secret identity as an initiation test for the Legion. |
| Genre | superhero |
| Script | Jerry Siegel |
| Pencils | Curt Swan |
| Inks | George Klein |
| Letters | Milt Snapinn |
| Reprinted | from Superboy (DC, 1949 series) #98 (July 1962) |
| Characters | Superboy [also appears as Clark Kent]; Lana Lang, Jonathan Kent; Martha Kent; Legion of Super-Heroes [Lightning Lad; Cosmic Boy; Saturn Girl]; Phantom Zone inhabitants [Jax-Ur; General Zod; Mon-El]; Legion of Super-Pets [Krypto; Streaky; Super-Monkey; Super-Horse] |
| Synopsis | Superboy is attacked by his friends in the Legion, under the evil influence of the Brain-Globes of Rambat. After the Legionnaires regain their senses, they gather four super-pets to defeat the Brain-Globes. |
| Genre | superhero |
| Script | Jerry Siegel |
| Pencils | Curt Swan |
| Inks | George Klein |
| Letters | Milt Snapinn |
| Reprinted | from Adventure Comics (DC, 1938 series) #293 (February 1962) |
| Characters | Supergirl [also appears as Linda Danvers]; Legion of Super-Heroes [Saturn Girl; Triplicate Girl; Phantom Girl; Cosmic Boy; Lightning Lad; Brainiac 5; Shrinking Violet; Bouncing Boy; Sun Boy]; Lori Lemaris; Jerro; Krypto; Brainiac (flashback); Koko (flashback) |
| Synopsis | Supergirl and Brainiac 5 become the newest members of the Legion of Super-Heroes. |
| Genre | superhero |
| Script | Jerry Siegel |
| Pencils | Jim Mooney |
| Inks | Jim Mooney |
| Letters | Joe Letterese |
| Reprinted | from Action Comics (DC, 1938 series) #276 (May 1961) |
| Characters | Superboy [also appears as Clark Kent]; Sun Boy (impostor); Tom Tanner; Legion of Super-Heroes [Cosmic Boy; Lightning Lad; Saturn Girl; Phantom Girl; Brainiac 5; Chameleon Boy; Sun Boy]; Lana Lang; Martha Kent; Chief Parker |
| Synopsis | Superboy meets new Legion member Sun Boy (who is later revealed to be an impostor). Meanwhile, reform school escapee Tom Tanner (a double for Clark Kent) tries to take over Clark's life in Smallville. |
| Genre | superhero |
| Script | Robert Bernstein |
| Pencils | George Papp |
| Inks | George Papp |
| Letters | Joe Letterese |
| Notes | Original story is partially rewritten from "The Two Clark Kents" in Adventure Comics #191 (August 1953). |
| Reprinted | from Adventure Comics (DC, 1938 series) #290 (November 1961) |
| Characters | Superman; Lex Luthor; Legion of Super-Villains [Cosmic King; Lightning Lord; Saturn Queen]; Legion of Super-Heroes [Lightning Man (adult Lightning Lad); Cosmic Man (adult Cosmic Boy); Saturn Woman (adult Saturn Girl)] |
| Synopsis | Luthor contacts and teams up with Legion of Super-Villains from 30th Century; adult Legion of Super-Heroes comes to 20th Century to help Superman. |
| Genre | superhero |
| Script | Jerry Siegel |
| Pencils | Curt Swan |
| Inks | Sheldon Moldoff |
| Letters | Milt Snapinn |
| Reprinted | from Superman (DC, 1939 series) #147 (August 1961) |
| Synopsis | The author covers the major events in the published history of the Legion of Super-Heroes. |
| Genre | superhero |
| Script | E. Nelson Bridwell ? |
| Letters | typeset |
| Reprinted | in Superboy #147 May-June 1968 Replica Edition (DC, 2003 series) #[nn] [re-typeset as line lengths are different] |