| 33 | Countdown (DC) | Origin of Riddler (Edward Nigma) |
| 33/NS | Countdown (DC) | Origin of Riddler (Edward Nigma) |
| Anl 8 | Detective Comics | Origin of Riddler; Year One; 1995 Annual |
| Anl 8-2 | Detective Comics | Origin of Riddler; Year One |
| SE 1 | Secret Origins (3rd Series) | Origin of Penguin; Origin of Riddler; Origin of Two-Face |
| SE 1/NS | Secret Origins (3rd Series) | Origin of Penguin; Origin of Riddler; Origin of Two-Face |