Ultraman Zero: Battle in Another Dimension

As Earth's civilization advances at a rapid pace, other civilizations set their sights on the planet. While pursuing Tartarus, Zero is caught in an accident and arrives in this universe. He discovers that something is wrong with Earth and decides to stay and resolve the crisis. During a battle, a warrior who sacrificed himself to save others catches his attention. That man becomes Zero's human host. As they search for a new home, an extraterrestrial civilization begins its invasion of Earth, aiming to wipe out humanity...