The Keepers

The Keepers are a somewhat mysterious race that are apparently responsible for the construction of the Sphere. They have surprisingly simple motives in abducting the inhabitants of Earth and thousands of other worlds. This race seeded thousands of worlds in the past (including Earth) for the simple purpose of harvesting whatever evolved upon these worlds for whatever was needed at the time, be it warriors or food.

Overview
Keepers possess small upper body with two small, three fingered hands. In the place of legs they possess two big, two fingered hands. Their body is mounted on a spherical shaped device that let's them levitate. They have giant brains protected by metal plating and two bright, yellow eyes. The upper jaw possesses multiple rows of pointy, sharp teeth, while instead of a jaw, they have four mandibles. They are highly intelligent and are able to speak and understand english.

Appearences over the course of Prey
The first Keeper appears in Level 11: Hidden Agenda. As Tommy walks through the corridor, he catches a glimpse of fleeting Keeper. Later in the same level he sees another Keeper jumping from portal to portal. In Level 12: Jen a Keeper calls to Art Bell and announces that the Dark Harvest is at hand. In Level 13: The Dark Harvest one Keeper attacks Elhuit and then disappears. In Level 20: Facing the Enemy Tommy fights a group of Keepers. This is the last level in which Tommy fights or sees the Keepers.

Trivia

 * It was confirmed by lead world designer, Nathan Cheever, that the keepers were to return as the main antagonists of Prey 2. Vengeful and bitter over the destruction of their Harvest Sphere, The Keepers built a new War Sphere to destroy Earth. At around mid-way through the game, it was going to appear above Exodus's skyline. In the final level of the game, Tommy and Killian were to infiltrate and destroy the War Sphere.