Mr. Waterballoon
Rex Rigid; Megaton Man Universe
- Also known as
Appearances
- The Return of Megaton Man #3 — 1988-09-10
- Savage Dragon vs. Savage Megaton Man #1 — 1993-03-00
- Don Simpson's Bizarre Heroes #1 — 1994-05-10
- Bizarre Heroes: The Apocalypse Affiliation #1 — 1995-04-00