The Eyes Have It by Philip K. Dick

There was no doubt of the thing in the next passage. Julia, whom I had thought to be the one normal person, reveals herself as also being an alien life form, similar to the rest.

The Defenders by Philip K. Dick

They stepped out of the car. A leady was approaching them rapidly. It coasted up in front of them and stopped, scanning them with its hand-weapon raised.

The Crystal Crypt by Philip K. Dick

Mara was staring up at the wall and the towers beyond. Under their feet the ground trembled, vibrating and shaking. She could see tongues of flame rising from the towers, from the deep underground factories and forges of the City. The air was thick and dense with particles of soot. Mara rubbed her mouth, coughing.