Earth-166 was an alternate universe in which Superman had twin sons, Jor-El II and Kal-El II.
- Flamebird (Kal-El II/Kalel Kent)
- Jor-El I
- Nightwing (Jor-El II)
- The Fantastic Story of Superman's Sons! was originally published as an imaginary story, a story outside of regular continuity. In Crisis on Infinite Earths: The Compendium, it was retconned as having happened on another Earth, .
- Characters from Earth-166
- Other things related to Earth-166
- Earth-166's Comic Appearances
- Reality Gallery: Earth-166
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