- Script:
- John Byrne (co-plot; script); Jerry Ordway (co-plot)
- Pencils:
- Jerry Ordway
- Inks:
- Dennis Janke
- Colors:
- Petra Scotese
- Letters:
- Albert DeGuzman
- Job Number:
- G-3836
- Genre:
- Superhero
- Characters:
- Superman [Clark Kent; Kal-El]; Supergirl [Matrix; as Lana Lang in flashback] (Pocket Universe); Lex Luthor (Pocket Universe); Pete Ross (Pocket Universe); Bruce Wayne (first appearance; Pocket Universe); Oliver Queen (first appearance; Pocket Universe); Hal Jordan (first appearance; Pocket Universe); Legion of Super-Heroes [Cosmic Boy; Lightning Lad; Saturn Girl] (flashback); VILLAINS: Time Trapper (flashback); General Zod (first post-Crisis appearance; Pocket Universe); Quex-Ul (first post-Crisis appearance; Pocket Universe); Zaora (first post-Crisis appearance; Pocket Universe)
- Synopsis:
- Lex Luthor explains how he was tricked into releasing the criminals from the Phantom Zone, and how they proceeded to kill billions of people.
Story contined from SUPERMAN (DC, 1987 series) #21 and story continues in SUPERMAN (DC, 1987 series) #22.
- Script:
- Renee Witterstaetter
- Letters:
- typeset
Letters from readers - Hurricane Heeran, Dale Coe, Chris Khalaf, Thomas Romano, Elizabeth Holden, Jeff Mitchell, Joe Hilliard, Jacob Gilbert, Ann C.H. Brachwitz and Jay Roe - and responses from Renee Witterstaetter.