History of character is unknown.
- Although this character was originally introduced during DC's Earth-One era of publication, their existence following the events of the 1985-86 limited series Crisis on Infinite Earths remains intact. However, some elements of the character's Pre-Crisis history may have been altered or removed for Post-Crisis New Earth continuity, and should be considered apocryphal.
- 5 Appearances of Doctor Z.Z. (New Earth)
- 3 Images featuring Doctor Z.Z. (New Earth)
- Quotations by or about Doctor Z.Z. (New Earth)
- Character Gallery: Doctor Z.Z. (New Earth)