Prototype is a 2009 action-adventure video game developed by Radical Entertainment and published by Activision. It was released in June 2009 for the PlayStation 3, Xbox 360, and Microsoft Windows. In July 2015, the game was re-released alongside its sequel as the Prototype Biohazard Bundle for the PlayStation 4 and Xbox One. Separate versions of the two games became available in August 2015. In Prototype, players control an amnesiac shapeshifter named Alex Mercer as he attempts to stop an outbreak of a virus called Blacklight in Manhattan, which mutates individuals into powerful, violent monsters. Alex also attempts to uncover his mysterious past while coming into conflict with both the US military and a black operations force called Blackwatch. Outside of the main story, players can freely explore the game's open world and engage in several different side activities.