User blog comment:Stoop Davy Dave/Multiversal Metallurgy/@comment-6369172-20200215011138/@comment-6369172-20200216043634

>>Any guesses what a mutagenic radioactive material is in Earth-One?<<

1/ Metamorpho met a mutagenic meteorite on Earth-One, but I don't think that element or substance was ever given a name.

2/ Vandal Savage's meteorite was a mutagenic radioactive material, and so was the Black Condor's, but both of those are in Earth-Two, and neither of those was given a name. Not even by Roy Thomas.