Synopsis
Spacecraft P-1, which was exploring the newly-discovered Planet X, meets aliens from the planet, known as Xiliens, from an advanced civilization – the Xiliens have been attacked by the fearsome monster, ‘Monster Zero’. The identity of Monster Zero is none other than the three-headed space dragon, King Ghidorah. In order to fight against King Ghidorah, the Xiliens ask Earth’s help by letting them borrow ‘Monster One=Godzilla’ and ‘Monster Two=Rodan’.