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| Heldorf | |
| Alias(es): | Doctor |
| Species: | Human |
| Origin: | Earth |
| First Appearance: | The Ambassadors of Death |
| Portrayed by: | Gordon Sterne |
Heldorf was a scientist working for General Carrington. He infused the Alien Ambassadors with radiation, following orders from the General reluctantly. Two of Reegan's henchmen killed him and his working assistant and abducted the aliens from his laboratory. (The Ambassadors of Death)