7.1 Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster Jul. 18, 1976 Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster IMDb: 7.1 1976 31 min 11 views A giant sea monster known as Dragonsaurus has emerged from out of nowhere, terrorizing the depths of the oceans. Great Mazinger, Grendizer and ... ActionAdventureAnimation
