Mumm-ra is a twin!?

Wildstorm:

http://www.comicvine.com/mumm-ra/11153/

And Marvel:

http://www.comicvine.com/mumm-ra/15982/

I thought Mumm-ra was Wildstorm, like the Thundercats?

Is Mumm-Rana his "good" twin or just somebody else?

no, that's not what I meant. There arer two different Mumm-ras....one marvel and oner wildstorm. He should be Wildstorm, not marvel.

I think that's around in the 80's when Thundercats originally aired, just like with Transformers and G. I. Joe. Sadly, those stories are almost forgotten.