Dr. Karl Hellfern
2 appearances on record
| Source | Claim | |
|---|---|---|
| This record Cover | Detective Comics #29 | 1939-07 |
Two records, shown side by side. A dispute is information, not an error.
Also recorded as: Dr. Karl Helfern, Karl Hellfern.
Related identities: Doctor Death.
| Issue | Date |
|---|---|
| Batman / Superman: Futures End #1 | 2014-11 |
| Supergirl #6 | 2025-12 |
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