Mazinger Z: Mycenae no Densetsu no Maki is a prequel manga to the original series by Go Nagai given away with the first produced models of the special edition 40th Anniversary DX Chogokin Mazinger Z models. It shows the origins of the Mazinger Z and the influence of its creation. Due to its limited numbers, the booklets are considered valuable by collectors, even more so than the models they were released with.