In other words, he is a king to some alien species.

It was hard to read body language among an alien species, but they didn't look very happy.

He was the only living man to have made first contact with an alien species.

That meant they were an alien species of some kind.

Though four alien species had been his allies and friends, he gave them little thought.

At the same time, more than 100 alien species have taken up residence.

No matter how many alien species they came across, a new one was always fascinating.

There were risks in being the first to meet an alien species.

When I left, not a single intelligent alien species was known.

The entire room was being created to give him information on how he could help the alien species survive.