"A New Power" (episodes 1-8): Ultraman Zero travels to the Monster Graveyard to train with his new powers granted to him by Dyna and Cosmos. There, he does battle with a Bat Alien who revives a group of monsters for Zero to fight.
"Zero's Radiance" (episodes 9-23): Ultraman Zero reunites with the Ultimate Force Zero, but they are ambushed by the "Darkness Five" whose goal is to revive the Emperor Alien. However, they accidentally revive Ultraman Belial, who takes over Ultraman Zero's body.