Terran (Gamera vs. Guiron)

The Terrans (テラの異星人, Tera no Seijin, Terra Star People) were a species externally identical to humans from the planet Terra, a mysterious Counter-Earth planet that had gone undiscovered as it sat on the other side of the solar system from Earth, and thus had been obscured from astronomers. The planet's population was decimated by giant monsters called Space Gyaos, leaving only two Terrans left, two women named Barbella and Florbella. Together, the two aliens held ownership over another monster, the guard dog-like Guiron, as a bodyguard.

The Terrans abducted two Japanese children from Earth with the intention of learning about Earth by consuming the brains of the children. The two where not aware that these two children also had a giant monster as a protector and where killed in an ensuing battle between it and their guardian when their base on Terra was destroyed, seemingly leaving the planet to the swarms of visiting Space Gyaos.

Culture and Society
Little is known about Terran society, save that injury alone was considered ground for termination of one's life as useless or otherwise hindering to the rest of society. The Terran people's ability to acquire knowledge through the consumption of another's brain, and an open readiness to do so to alike bodied individuals, indicates that a level of cannibalism was present. The final days of their civilization was shaped by the constant onslaught of Space Gyaos. Evidently as individuals where injured or killed in these attacks they became food for the survivors until only two remained. The amount of technology around consuming an individual's brain would indicate that such had some significant role in their society, possibly associated with the transfer of leadership.

Technology
Terran's had some level of medical knowledge through not with the intention of saving lives. It's stated that an individual's brain must be alive for one to learn from consuming it and thus their medical equipment was designed to keep individuals in a sedated state to put up no resistance that would otherwise have the potential to harm the consuming person.

Terran's also had mind controlling devices with the most notable having been used upon the native Guiron to direct it towards the defense of their world from the Space Gyaos.

They also developed spacecraft though the threat of the Space Gyaos made research in such difficult and it's possible that previous space flights had drawn the Space Gyaos to the planet. Prior to the population being reduced to two a single saucer capable of travel to Earth was built. The craft was small and likely designed either for scouting or to send envoys to the planet. The motive for it's creation isn't known but the two surviving Terrans had planned to settle on Earth after learning what they could about the planet by consuming the brains of two teenage natives. They ultimately hopped that they'd be able to blend in far from their besieged world though this plan for escape failed to reach completion.

Appearances

 * Gamera vs. Guiron (1969)