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Doctor-7 was an evil sorcerer and the arch-enemy of the supernatural sleuth Mark Merlin. By using his magical powers, he created a formula (with Radium) which enabled an evil ally named Morloo to remain on Earth, but the results were only temporary.

Shortly after their last battle,[1] Mark Merlin was killed in another dimension,[2] and perhaps with his nemesis finally dead, Doctor-7 has not been seen since.

  • This version of Doctor Seven (Earth-One), including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths event and later restored following the rebirth of the infinite Multiverse during the Dark Crisis of 2022-2023. Even though other versions of the character may have appeared, this information does not apply to those versions.

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