Good collection of the facts (as far as we know them) of the whole saga. Super brief version: Alan Moore wrote a comic called “Miracleman” in the 80s. Neil Gaiman took over the series and copyright after Moore’s run. Todd McFarlane bought the company that published Miracleman and tried to screw Gaiman out of his share of the rights to it. They’ve very recently settled.
It’s pretty easy reading this to work out who the villain of the piece is. (It’s not Young Nastyman.)