But explorers have found extraterrestrial species that got an evolutionary advantage from developing the system further, in their particular environments.

The Cardassians are an extraterrestrial species in the Star Trek science fiction franchise.

This was a genuine extraterrestrial planetary species, and the very realization of its existence was nearly overwhelming.

The earth had been taken by an extraterrestrial species as ruthless as might have been a race of intelligent crocodiles.

In fact, the aliens looked very human, more so than almost any extraterrestrial species the first officer had ever seen.

The movie begins with an extraterrestrial humanoid species, the Glegoliths, wandering through space in search of a new world.

The Elder Things were the first extraterrestrial species to come to the Earth, colonizing the planet about one billion years ago.

At some stage Phillip managed to corrupt two members of an extraterrestrial species.

The extraterrestrial species that built the monoliths developed intergalactic travel millions or perhaps billions of years before the present time.

As they investigated the marvels of their home in space, the family again encountered the extraterrestrial species they had met earlier.