The fourth trailer for The Host has arrived! Take a look:
After a race of parasitic aliens come to Earth and take over human bodies, most of the planet has been conquered. Saoirse Ronan stars as Melanie Stryder, one of the last uninhabited humans. But when her body is finally taken over, she fights back from within to reunite with the boy she loves.
Jake Abel, Max Irons, Chandler Canerbury, Diane Kruger, William Hurt, Boyd Hobrook, and Scott Lawrence also star.