Mazinkaiser VS Great General of Darkness Blu-ray contains the OVA directed by Masahiko Murata.

They strike without warning and instantly plunge the world into terror. The Great General of Darkness leads the underground Mycenae Empire in a bid to conquer Earth. The Mazinger Army falls before the seven generals under him, each of them leading an army of superior Warrior Beasts. Meanwhile, Archduke Gorgon is relentlessly pursuing Koji Kabuto, trying to eliminate him before he can reach Mazinkaiser. But a red light in the sky over Mt. Fuji portends the greatest battle in history!

Released for the first time in North America, and now including a brand new English dub from Kocha Sound! In 1080p high definition, with the original Japanese language, and English subtitles!