She wanted a chance to get engineers and scientists inside their ship before the aliens left.

The visiting aliens leave in haste and one of them is left behind.

The aliens also leave behind one of their own, an individual named Orgoth.

But some aliens have already left and others are planning to.

The aliens had left the communicator going, like everything else in the base.

There are some small signs that if times get tough enough, aliens will indeed leave the country.

After that, the aliens left his team alone for a week.

On each planet the aliens leave one of those golden things you see in the cylinder.

We're nearly there, and I can't believe the alien will have left the heart of its system unprotected.

For half an hour the aliens had left them alone.