| 1 | Zero Hour: Crisis in Time | 1st Appearance of David Knight; 1st Appearance of Jack Knight; 1st Appearance of Parallax; (#4 in sequence); Silver Age Atom de-aged |
| 1/A | Zero Hour: Crisis in Time | 1st Appearance of David Knight; 1st Appearance of Jack Knight; 1st Appearance of Parallax; (#4 in sequence); Silver Age Atom de-aged |
| 1/NS | Zero Hour: Crisis in Time | 1st Appearance of David Knight; 1st Appearance of Jack Knight; 1st Appearance of Parallax; (#4 in sequence); Silver Age Atom de-aged |