Thread:EauDeBla/@comment-1809047-20130703141135/@comment-86.31.34.128-20130703175206

I know half way through, Mazinger Z switched Magazine from Shounen Jump to go to TV Magazine. That's where he started following the anime version more closely. That explains why Boss suddenly shows up as well. The thing is, Mazinger Z went through a lot of editions, and some have missing short stories, pages etc. Quite a mess to be honest.

This is where I get my info (It's in French though but I understand it)

http://gettermario.dynamicforum.net/t3250-mazinger-z-mangaversion-de-go-nagai?highlight=mazinger+z+manga