| Issue | #21 |
| Published | August-September 1966 |
| Cover Price | 0.12 |
| Pages | 36 |
| Editing | Bob Kanigher |
| Genre | Science Fiction; Superhero |
| Pencils | Ross Andru |
| Inks | Mike Esposito |
| Characters | Batman (cameo); Robin (cameo); Flash (cameo); Wonder Woman (cameo) |
| Script | Bob Kanigher |
| Pencils | Ross Andru |
| Inks | Mike Esposito |
| Notes | Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (May 2007). Schwartz kept editorial records for Robert Kanigher who edited this issue. |