Professor Metzner also researched human evolution. In the past he created an evolution machine to unlock the potential of his mind by turning him into a future man. But the results frightened him, and he reversed the process just in time, restoring himself to normal. Still, the experiment created a split personality. Said personality was an arrogant, power-hungry, ruthless megalomaniac that firmly believed Might makes Right. Metzner could only suppress his evil personality by hypnotizing himself into forgetting the incident.
Eventually, his mutant personality managed to take over. The mutant projected a huge image of himself above Chicago and declared himself the ruler of the city. His claim was challenged by Supergirl, who found his formidable mental powers made him a powerful adversary.
During the course of the fight, Supergirl figured out that mutant was her professor. Kara tried to reach Metzner out, urging him to take control again, and then deceived the mutant into thinking he destroyed her with a mental blast. The anguish of guilt caused the mutant to revert to Dr. Metzner again.
Supergirl chose that moment to reappear. A grateful, normalized Metzner said he was firmly in control of his other self again. Unfortunately he still had to do some explaining to the law, and the authorities took him away.
- Mutation: Professor Metzner's evolutionary experiment turned him into a bald, hairless, big-headed, red-eyed, spindly-limbed creature with vast psychic powers.
- Astral Projection
- Supergirl Recommended Reading
- Action Comics (Volume 1)
- Adventure Comics (Volume 1)
- All-Star Comics (Volume 1)
- Supergirl (Volume 1)
- Superman Family (Volume 1)
- Supergirl (Volume 2)
- Infinity Inc. (Volume 1)
- Power Girl (Volume 1)
- Supergirl (Volume 3)
- Supergirl (Volume 4)
- Supergirl (Volume 5)
- Supergirl and the Legion of Super-Heroes (Volume 1)
- Power Girl (Volume 2)
- Supergirl (Volume 6)
- Worlds' Finest (Volume 1)
- Supergirl (Volume 7)
- 7 Appearances of Barry Metzner (Earth-One)
- 2 Images featuring Barry Metzner (Earth-One)
- Quotations by or about Barry Metzner (Earth-One)
- Character Gallery: Barry Metzner (Earth-One)
- Supergirl at Wikipedia.org
- Supergirl at DC Comics
- Supergirl at TV Tropes
- Supergirl at Supermanica
- Supergirl Comic-Book Chronology
- Power Girl at Wikipedia.org
- Power Girl at TV Tropes
- Power Girl at Supermanica
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