The day has come for Horoboros, a monster that Yuka saw as a child, to awaken from its long slumber! The key to appeasing the raging Horoboros lies in a mysterious word recorded in an ancient document. Yuka sets out to decipher this writing, but Kaburagi's dark power is reaching out to Horoboros...!

The Space Pirate, Alien Barossa, has returned! Alien Barossa is determined to steal Ultraman Z's new weapon. Beliarok. Our hero cannot allow Beliarok's hidden power to fall into the hands of an evil alien. With Juggler also in the mix. the battle for the mystic sword begins!