The project is based on Stephenie Meyer's novel of the same name, which centers on parasitic alien creatures called Souls who can take over a human body. Saoirse Ronan stars as a young soldier who is taken over by a Soul dubbed The Wanderer, although the soldier puts up a fight, refusing to let go of her identity. The Wanderer becomes obsessed with the soldiers memories, and sets out to find her boyfriend and lost brother. Diane Kruger will portray The Seeker, who tracks down The Wanderer.
Andrew Niccol will direct from his own screenplay, which is adapted from Stephenie Meyer's novel. Max Irons, Jake Abel, and William Hurt also star.
It isn't known when production may begin on The Host.