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History of character is unknown.
- While fused with one of Mephisto's demons, Gregory could create warps to other dimensions and realities. He also possessed minor mystical abilities.
- Briefly fused with a demon.
- Appearances of Gregory O'Sullivan (Earth-616)
- Media Gregory O'Sullivan (Earth-616) was Mentioned in
- Images featuring Gregory O'Sullivan (Earth-616)
- Quotations by or about Gregory O'Sullivan (Earth-616)
- Character Gallery: Gregory O'Sullivan (Earth-616)
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- ↑ Official Handbook of the Marvel Universe A-Z hardcover Vol. 8, Mys-Tech entry
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