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| Real Name: Erik Christos | ||||||||
| Also Known As: | ||||||||
| Place Of Birth: Angor | ||||||||
| First Appearance: Justice League Europe Vol.1 15 | ||||||||
| Known Associates: | ||||||||
| Group Affiliation: The Extremists | ||||||||
| Base Of Operations: Mobile | ||||||||
| Grudges: Justice League Of America | ||||||||
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| Magnetic Control: Doctor Diehard is capable of manipulating and channelling magnetic fields. He can manipulate iron and iron-based alloys to his whim. He can explode metal constructs, and manipulate ferrous objects with nearly unlimited range. He can also fly under this own power. | |||||||
| Robot: Doctor Diehard is a robotic construct and has been deactivated and reactivated on numerous occasions. | |||||||
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| Erik Christos was a member of an ambitious group of five terrorists that attempted to steal an experimental megabomb on the planet Angor. When the bomb detonated accidentally, the men did not die; they were mutated into the most powerful beings on the planet Angor and formed the Extremists. Christos adopted the name Doctor Diehard. | ||||
| The Extremists triggered a nuclear holocaust on the planet Angor and Doctor Diehard was killed but he was remade as an android. Led by Dreamslayer the Extremists travelled to Earth in an attempt to conquer it. | ||||
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