Prototype ( is an action game developed by Radical Entertainment. The game was released in North America on June 9, 2009 and in southwestern parts of North America and Oceania on June 10. The game was released in Europe on June 12. The game is available on Microsoft Windows, Xbox 360, and PlayStation 3 platforms. Prototype was released a day early in Australia.

The game is set in New York City as a virus infects people and the military attempts to put an end to it. The protagonist of the story is named Alex Mercer, who has enemy-absorbing and shapeshifting powers. He can take memories, experiences, biomass and physical forms of the enemies through absorption. Alex can also shapeshift into more specialized forms for attack, defense or sensory enhancement. All of these together are intended to give players multiple ways to complete their objectives. Parallel to the game's storyline is the ability to play the game as a sandbox-style video game giving the player free roam of Manhattan.