I do not remember what show it was from but I once heard a story on a radio show about humans colonizing an alien planet, but they end up deciding to abandon the planet when they notice that the adolescent aliens are starting to look more and more like humans. The aliens have the ability to change their appearance to copy other creatures but only when young, and it takes them several months to change. The twist ending of the episode is that one of the main characters had been an alien the entire time as the real version of him had died in an accident.
I do not remember what show it was from but I once heard a story on a radio show about humans colonizing an alien planet, but they end up deciding to abandon the planet when they notice that the adolescent aliens are starting to look more and more like humans. The aliens have the ability to change their appearance to copy other creatures but only when young, and it takes them several months to change. The twist ending of the episode is that one of the main characters had been an alien the entire time as the real version of him had died in an accident.