| 25 | Countdown (DC) | Origin of Killer Frost; Countdown to Final Crisis |
| 25/NS | Countdown (DC) | Origin of Killer Frost; Countdown to Final Crisis |
| 3 | Firestorm | 1st Appearance of Killer Frost; 1st Appearance of Killer Frost (Crystal Frost); Origin of Killer Frost (Crystal Frost) |