The Earth is under attack by alien invaders.

While the daughters of the Viking invaders were brought up by their English mothers and learned to speak good English, the little boys ran along with their fathers picking up less than grammatical English from them, as a result of which, to this day, poor grammar is associated with masculinity in the Anglo-Saxon world.

One village of indomitable Gauls still resists the invaders.

The family dynamic behind such a character-driven movie without many plot twists or alien invaders to offer is the real reason for its success.

Food allergy sufferers can experience fatigue and brain fog as the immune system attacks a nonexistent invader.

They defended their homeland against the invaders.

The natives heard a gunshot and thought that the invaders were in the forest.

The majority of Berbers are mountain dwellers. It's obvious: they've never accepted to drown in the invaders' identity.

They yielded their land to the invaders.

But the invasive European green crab pushes native crabs out of their burrows. Under pressure from the invader, native crabs are eating less marsh grass. Marshes are recovering, and their carbon storage capacity is growing with them.