Summer
| Release: | 1941 |
| Cover: | 1941 |
The Man Who Couldn't Remember / The Unknown X
| Release: | 1941 |
| Cover: | 1941 |
"The Man Who Couldn't Remember" - Batman and Robin are working to protect a new D.A. from organized crime, but soon find that the only witness to his murder has amnesia. They protect the man, not realizing why thugs are still after him.
"The Unknown X" - A criminal known only as the Unknown X is running rampant in Metropolis. Superman starts investigating, and finds ties back to Jameson, the man in charge of the committee against Unknown X.
| Writer | Jerry Siegel, Howard Purcell, Harry Lampert, Henry Boltinoff, Ed Moore, Joseph Sulman |
| Artist | Howard Purcell, Harry Lampert, Henry Boltinoff, Joe Shuster, Ed Moore, Joseph Sulman |
| Cover Artist | Fred Ray |
| Batman | Bruce Wayne |
| Superman | Kal-El / Clark Kent |
| Lois Lane | |
| Robin | Dick Grayson |
| Perry White | |
| Crimson Avenger | Lee Travis |
| Linda Page | |
| Sgt. Casey | |
| Drafty | |
| Red, White & Blue | |
| Lando | |
| The King | |
| Johnny Thunder | John L. Thunder |
| Young Doc Davis | |
| Punch Parker | |
| Zatara | Giovanni "John" Zatara |
| Age | Golden Age |
|---|---|
| Format | Comic |
| Series Group | Superman / Batman |
| Genre | Action | Adventure | Super-Heroes |
| No. of Pages | 96 |
| Country | USA |
| Language | English |