| 0 | The Menace of the Mystery Legionnaire! | cover | 1 | pencils: Curt Swan; inks: George Klein; letters: Ira Schnapp | Legion of Super-Heroes [Saturn Girl; Superboy; Colossal Boy; Brainiac 5] |
| 2 | The Secret of the Mystery Legionnaire! | comic story | 8 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: David Huffine | Legion of Super-Heroes [Triplicate Girl; Cosmic Boy; Invisible Kid; Mon-El; Chameleon Boy; Star Boy; Colossal Boy; Sun Boy; Shrinking Violet]; Dynamo Boy [Vorm]; Pargg; Eye-ful Ethel; The Mess |
| 4 | - | letters page | 0.67 | letters: typeset | |
| 5 | Coming... Super-Attractions! | promo (ad from the publisher) | 0.33 | | |
| 6 | - | comic story | 0.67 | script: Henry Boltinoff; pencils: Henry Boltinoff; inks: Henry Boltinoff; letters: Henry Boltinoff | Casey the Cop |
| 8 | Friends Across the Seas | public service announcement | 1 | script: Jack Schiff; pencils: Sheldon Moldoff; inks: Sheldon Moldoff; letters: Ira Schnapp | |
| 9 | Part II: The Victory of the Evil Legionnaire! | comic story | 8 | script: Jerry Siegel; pencils: Jim Mooney; inks: Jim Mooney; letters: David Huffine | Legion of Super-Heroes [Superboy; Shrinking Violet; Cosmic Boy; Saturn Girl; Chameleon Boy; Triplicate Girl; Ultra Boy; Star Boy; Sun Boy; Brainiac 5; Colossal Boy; Element Lad; Invisible Kid; Lightning Lad; Light Lass]; Dynamo Boy |
| 10 | 80 Page Giant; More Secret Origins | promo (ad from the publisher) | 0.5 | | |
| 12 | - | comic story | 0.67 | script: Henry Boltinoff; pencils: Henry Boltinoff; inks: Henry Boltinoff; letters: Henry Boltinoff | Chief Hot Foot; Medicine Man |
| 13 | Statement of Ownership, Management and Circulation | statement of ownership | 0.33 | script: Irwin Donenfeld | |
| 14 | A Job for Super-Dog | comic story | 8 | script: Otto Binder; pencils: Curt Swan | Superboy [Clark Kent]; Krypto |
| 17 | 10 Issues of Adventure for Only $1.00 | promo (ad from the publisher) | 1 | letters: typeset | |