Sierra Entertainment today announced PROTOTYPE, a completely new kind of open-world game, featuring a storyline with conspiracy, deception and deadly shape shifting action. Developed by Radical Entertainment, PROTOTYPE 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 shapeshifting powers allow him to become an exact replica and steal the skills or powers of anyone who crosses his path. PROTOTYPE debuts on the PLAYSTATION 3, Microsoft's Xbox 360 and PC in summer 2008.