Details are light on this one but Toei Animation has revealed that there will be an anime feature film for Mazinger Z to celebrate its 45th anniversary this year. The project is tentatively called Gekijouban Mazinger Z and will have a larger presentation for it at AnimeJapan 2017 on March 26th.
Based on the original work by Go Nagai, there was a 92-episode TV series that began in 1972 that was picked up by Discotek Media. There have been several other TV and OVA series over the years and movies as well.
Original Series Concept: Koji Kabuto’s grandfather has discovered two resources which can save humanity: Photon Light Energy and the ultra-impregnable alloy Chogokin Z. However, Dr. Kabuto’s research is abruptly cut off when the evil Dr. Hell sends his trusted lieutenant, the bisected Baron Ashura, to assassinate him! Koji, now orphaned along with younger brother Shiro, swear revenge using Dr. Kabuto’s last and greatest invention: the super robot Mazinger Z!
Joined by Dr. Kabuto’s successor, Dr. Yumi, his daughter Sayaka, and her research robot Aphrodite A, Koji sets out to protect Japan from Dr. Hell’s menacing mecha monsters and ensure the peaceful work of the Photon Light Institute. Can Koji and Sayaka, along with local bully boy Boss, prevent this most dangerous of villains from running amok and conquering the world?
[Source: Anime! Anime!]