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The Terran UFO first appears at the start of the film, where it arrives on Earth, empty. Two kids, Akio and Tom, decide to ride out on their bicycles to investigate the spacecraft. When they arrived, they entered its control room. When they did this, the spacecraft suddenly powered up, and flew off across the Solar System towards Terra. Gamera noticed the spaceship departing, and took off in hot pursuit. The spaceship landed on Terra, where the two kids then met the Terrans.
Later, after the kids let Guiron loose from his underground home, the kaiju began to attack the base. The two Terrans tried to flee in another Terran UFO, but both of them died when Guiron continued to attack.
After the Terrans and Guiron were both dead, Gamera accompanied the children back to Earth, following them as they flew back home in another Terran UFO.
- The Terran UFO can fly at incredibly high speeds, able to easily evade Gamera.
- The Terran UFO can be controlled remotely.