What are Rock Soldiers?

[Original TMNT Cartoon Fan]

Originally Posted by Coola Yagami

They were apparently mutanted from rocks... how the hell does THAT work? How does mutagen mutate something that isn't really alive...?

Ah.. same way Mutagen somehow turned Garbageman and Joe Eyeball into a living mountain of trash and some stem-eyeballed alien thingie...

It can probably just mutate rocks from some Dimension X planets and asteroids, not Earth I suppose.