Sierra today announced the launch of the official website for Prototype, offering screenshots, trailers and new details about this completely new kind of open-world game which tells the story of Alex Mercer, a man haunted by his past, fighting a secret war in New York City. As the action spirals out of control, a conspiracy tied to his origins threatens the future of mankind itself. Mercer's amazing shapeshifting powers allow him to become an exact replica and steal the skills or powers of anyone who crosses his path. In the works at Radical Entertainment, Prototype will be available this fall, for PC, Xbox 360 and PS3. Press 'read more' for details - nine new screenshots found their way in our gallery.