Mazinkaiser: Shitou! Ankoku Dai Shougun
English title: Mazinkaiser VS Great General of Darkness
Japanese title: マジンカイザー　死闘！暗黒大将軍
Alternative titles: Mazinkaiser: OVA 8
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Jul 25, 2003
Duration: 56 min
Rating: R - 17+ (violence & profanity)
Studios: Brain's Base
Producers: Bee Media, Dynamic Planning
Licensors: Discotek Media
Genres: Action
Themes: Mecha

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! 

(Source: Discotek)