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Real Identity: Not Applicable
Appearances (BTAS): Mudslide
Powers/Skills: Mutagen
Voiced By: Not Applicable

The MP-40 Isotope is an experimental mutagenic adaptagen developed by Wayne Bio-Medical. Dr. Stella Bateson hypothesized the MP-40 would restore Clayface to a human and allow him to keep, even increase, his shape shifting power. During the procedure, Batman intervened and the angered Clayface attacked. For some time, a dissolved Clayface, the MP-40, and industrial waste interacted. It was enough to resurrect the villain and give him new powers.