| Issue | #4 |
| Published | July-August 1973 |
| Cover Price | 0.20 USD |
| Pages | 36 |
| Editing | E. Nelson Bridwell |
| Notes | Credits from GCD index of original printing. |
| Characters | Colossal Boy; Superboy; Star Boy; Sun Boy; Lightning Lad; Cosmic Boy; Saturn Girl |
| Genre | Superhero |
| Pencils | Curt Swan |
| Inks | Sheldon Moldoff |
| Letters | Ira Schnapp |
| Notes | Credits from GCD index of original printing. |
| Reprinted | from Adventure Comics (DC, 1938 series) #341 |
| Characters | Legion of Super-Heroes [Mon-El; Chameleon Boy; Superboy; Light Lass; Brainiac 5; Cosmic Boy; Star Boy; Sun Boy; Saturn Girl; Triplicate Girl [also as Duo Damsel]; Lightning Lad; Shrinking Violet; Matter-Eater Lad; Colossal Boy; Ultra Boy; Phantom Girl]; Computo; Proty II [also as The Weirdo Legionnaire]; Batman (cameo); Superman (cameo); Joker (cameo) |
| Synopsis | The Legionnaires go underground to regroup before taking on Computo after he kills one of Triplicate Girl's bodies. |
| Genre | Superhero |
| Script | Jerry Siegel |
| Pencils | Curt Swan |
| Inks | Sheldon Moldoff |
| Letters | Milton Snapinn |
| Notes | Story continues from previous issue. Writer credits confirmed by Martin O'Hearn. Inking credited to George Klein on item, but credited to Sheldon Moldoff in later reprintings. Lettering credit from GCD index of original printing. Phantom Girl is colored as Triplicate Girl on page 3. A monument to Beast Boy, from the Heroes of Lallor, is shown on Shanghalla, where the remains of one of Triplicate Girl's body are sent. Triplicate Girl takes on the identity of Duo Damsel in this story. |
| Reprinted | from Adventure Comics (DC, 1938 series) #341 |
| Script | Allan Asherman |
| Letters | typeset |
| Notes | Article on surprising changes affecting the Legionnaires. |
| Characters | Legion of Super-Heroes [Superboy; Shrinking Violet; Colossal Boy; Brainiac 5; Chameleon Boy; Mon-El; Ultra Boy; Light Lass; Saturn Girl; Cosmic Boy; Lightning Lad; Invisible Kid; Duo Damsel; Sun Boy]; Computo; Bouncing Boy |
| Synopsis | The Legion eliminates the threat of Computo with anti-matter. |
| Genre | Superhero |
| Script | Jerry Siegel |
| Pencils | Curt Swan |
| Inks | Sheldon Moldoff |
| Letters | Milton Snapinn |
| Notes | Writer credits confirmed by Martin O'Hearn. Inking credited to George Klein on item, but credited to Sheldon Moldoff in later reprintings. Lettering credit from GCD index of original printing. |
| Reprinted | from Adventure Comics (DC, 1938 series) #341 |
| Characters | Tommy Tomorrow; Brent Wood; Bart Bruce |
| Synopsis | Tommy and Brent stop the transport of smuggled forbidden robots. |
| Genre | Science Fiction |
| Script | Otto Binder |
| Pencils | Jim Mooney |
| Inks | Jim Mooney |
| Notes | Writing credit from GCD index of original printing. |
| Reprinted | from Action Comics (DC, 1938 series) #233 |