In this DVD mini-series prequel to "Mega Monster Battle: Ultra Galaxy Legends The Movie", Ultraman Mebius travels to the Monster Graveyard after answering a distress call from Ultraman Hikari. When he arrives, he confronts the revived four servants of the Emperor Alien, who have held Hikari hostage. Their goal is to resurrect the Emperor Alien by using the legendary Giga Battle Nizer, but suddenly the mysterious Mecha-Zamu appears to aid Mebius.