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History of character is unknown.
enemy of Captain Marvel Jr.
- 1 Appearances of Mister Hydro (Earth-S)
- 1 Images featuring Mister Hydro (Earth-S)
- Quotations by or about Mister Hydro (Earth-S)
- Character Gallery: Mister Hydro (Earth-S)
This character is or was primarily an enemy of Captain Marvel, the Wizard Shazam, or any of the extended members of the Marvel Family. This template will categorize articles that include it into the category "Marvel Family Villains."