| Issue | #7 |
| Published | April-May 1959 |
| Frequency | bi-monthly |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Jack Schiff (Editor); Murray Boltinoff (Associate Editor); George Kashdan (Associate Editor) |
| Notes | Correct editor credits, correct story page counts, story synopses, and all additional sequences from Ed Boner, February 2009. |
| Characters | Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis] |
| Genre | Adventure |
| Pencils | Jack Kirby |
| Inks | Jack Kirby |
| Letters | Ira Schnapp |
| Reprinted | in Challengers of the Unknown (DC, 1973 series) #78; in Challengers of the Unknown Archives (DC, 2003 series) #2 (May 2004); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1 |
| Characters | Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis]; Alien visitors |
| Synopsis | Alerted by a friend to the discovery of a crashed spaceship, the Challengers investigate and find three alien creatures that had been held captive in that ship. The Challengers see if they have enough borrowed time to get the creatures back in their cages. |
| Genre | Adventure |
| Script | Jack Kirby; France Herron |
| Pencils | Jack Kirby |
| Inks | Wally Wood |
| Reprinted | in Challengers of the Unknown Archives (DC, 2003 series) #2 (May 2004); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1 |
| Synopsis | Advocating tolerance for others different than yourself. |
| Genre | fact |
| Script | Jack Schiff |
| Pencils | Bernard Baily |
| Inks | Bernard Baily |
| Letters | Ira Schnapp |
| Notes | Published in cooperation with the National Social Welfare Assembly. Later appeared in DC comics cover-dated April 1966. |
| Letters | typeset |
| Genre | Humor |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Characters | Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis]; June Robbins |
| Synopsis | After hearing a television report about a burglar with the ability to walk through walls, the Challengers begin to patrol the city with honorary member June Robbins coming along for the ride. They arrive too late to stop another robbery, but they pursue the thief to his island hideout. The hideout of the burglar, Anton Zammer, is the abandoned laboratory of the late Prof. Macon, who left behind a number of inventions Zammer now intends to use for his own gain. He starts with a shrink ray which allows him to capture and cage the Challs. Fortunately, their honorary member doesn't get shrunk, and has the smarts to save the day. |
| Genre | Adventure |
| Script | Jack Kirby; France Herron |
| Pencils | Jack Kirby |
| Inks | Wally Wood |
| Reprinted | in Challengers of the Unknown (DC, 1973 series) #78; in Challengers of the Unknown Archives (DC, 2003 series) #2 (May 2004); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1 |
| Genre | Humor |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |