The Pairans are a race of creatures which resemble starfish. They have one massive eye in the center of their bodies. When in their true forms, the Pairans are shown to be very large, with a height of at least 4 meters.
A spaceship travels through space and connects to a much bigger one. Aboard the ship, Pairans discuss how to warn humans of the incoming threat they just discovered. Some Pairans are sent to Earth, but they failed at making contact with humans and frightened them instead. After unsuccessful attempts at making contact with humanity, the starfish-like Pairan aliens hatch a plan to disguise one of their own as Hikari Aozora, a popular Japanese entertainer. The aliens' leader, Ginko Amano, volunteers for the task, stepping into an odd, circular device and taking on a human form. Ginko is found floating in a lake by Toru Isobe, believing himself to be rescuing her. As she goes about life on Earth, Ginko begins to reveal superhuman traits, such as jumping 10 feet into the air or appearing in different places without making any sound. She was also able to completely understand Taeko Matsuda's work on a nuclear device, raising suspicion. Later, as a group of scientists discusses the phenomena, Ginko levitates towards them and reveals her true identity. She explains to them that she is from Planet Paira and that a rogue planet is on a collision course with the Earth. They appeal to the World Congress about the situation but are rejected. Though, the Congress soon realize the validity of Ginko's warnings, launching nuclear weapons at the fast-approaching planet in the hopes to destroy it. The Pairans create a nuclear weapon of their own using Matsuda's research, and destroy the rogue planet with it, saving the Earth. Ginko then returns to her spacecraft, shedding her human disguise.
- Pairans can take the form of a human being through mutation to avoid being detected.
- When transformed into a human form, Pairans display various superhuman characteristics:
- They are extraordinary jumpers, being able to leap to heights of ten feet.
- They can teleport and materialize in new locations without needing to walk.
- Pairans can communicate with other Pairans via telepathy.
Ginko Amano, disguised as Hikari Aozora
- Interestingly, The Paira Aliens were advertised as giant rampaging monsters in publicity stills for the 1958 release, even though no such scene takes place in the movie.
- A lone Pairan makes a cameo appearance in the Zigra anatomy artwork used for Shout! Factory's 2011 DVD release of Gamera vs. Zigra and Gamera: Super Monster, trapped within one of the monster's three stomachs alongside various marine animals. The other two house Gamera's child friends and a swarm of Nezura.
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