In Gamera vs. Guiron, the film introduced us to Barbella and Flobella - two Terran women who explained that their world was devastated by the Space Gyaos, with the Terrans who tried to travel to another planet in a big spaceship dying as the ship was brought down. Those who remained - even with Guiron as their "guard dog" to protect them from the Space Gyaos - eventually died off and thus left the two women as the last of their kind.
In the original, the two women had effectively gone mad; even intending to eat the brains of two boys from Earth in the hope of "acquiring their knowledge" to help them adapt to life on Earth, where they intended to go once the ship that had brought the boys was fixed (as it was damaged when landing on Terra).
However, what if the Terrans weren't evil and were instead portrayed more sympathetically - having sent their ship to Earth to analyze the planet in order to make sure they could survive there before the two boys ended up accidentally getting transported to Terra, although that would also prove that the two women could co-exist alongside humanity. Additionally, and before they learned the Terran's true intentions, the boys in the original thought the women would be popular on Earth.
So, assuming that all four were able to go back to Earth together - Gamera carrying the ship in his mouth like in the original, while the women would release Guiron from their control so he could continue living and hunting the Space Gyaos without starving to death - and the women were indeed accepted by the populace, do you think them settling in on Earth would do anything meaningful for the remaining Showa Era films (Gamera vs. Jiger, Gamera vs. Zigra and Gamera: Super Monster)?
Curious to see what you guys think.