Was heißt »Alien« auf Englisch?

Das Substantiv Alien lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Mary wurde von Aliens entführt.: Mary got abducted by aliens.
Der Alien ist körperlos, wie ein Geist.: The alien is incorporeal, like a ghost.

"He claims to have slept with an alien." "Who, Tom?" "Who else?"
It may have been an unidentified flying object, but it was almost certainly not an alien spacecraft.
That hairy space alien doesn't speak English; he just understands it.
This landscape looks like an alien landscape.
This desert looks like an alien landscape.
Tom dressed as an alien for Halloween.
The Earth is under attack by alien invaders.
I don't believe in alien life.
The alien is a small intelligent multidimensional parasite that attaches to the host's nervous system.
The green alien is humanoid and stands at 3.7 metres.
Do you think Tom could be an alien?
I heard they found an alien artifact on the moon.
The alien shot his ray gun and blasted a hole in the spaceship's hull.
Their ideas seem totally alien to us.
This gold Rolex is an expensive watch alien to my lifestyle.
Those ideas are alien to our way of thinking.