Is the Netherwitch an actual person/being that Mumm-Ra was impersonating, or is the Netherwitch simply a created disguise of Mumm-Ra?
I always took it as the ‘Netherwitch’ being an old Third Earth folklore name for Mumm-Ra. Doesn’t Mumm-Ra say something along the lines of “Little does Lion-O know that the Netherwitch and Mumm-Ra are one and the same”?