Highlights:

- A mutant was any being who had been affected by mutagen
- Mutagen was a gelatinous chemical substance from Dimension-X

Effects:

- Mutants took on the traits of the things they transformed into:
- Like animals taking on human traits or humans taking on animal traits
- On rare occasions, beings could be mutated into objects:
- Like living garbage or even just a mess of living organs
- Exposure to Mutagen without contact with anything: turns you into a mutant blob