Dr. Karl Hellfern
Doctor Death, Batman villain
- Also known as
Appearances
- Detective Comics #29 — 1939-07-00
- Detective Comics #30 — 1939-08-00
- Batgirl #44 — 2003-11-00
- Batgirl #49 — 2004-04-00
- Batgirl #50 — 2004-05-00
- 52 #49 — 2007-06-00
- Batman #682 — 2009-01-00
- Batman by Grant Morrison #2 — 2025-11-00