Call of Duty: World at War is a first-person shooter video game developed by Treyarch and published by Activision for Microsoft Windows, PlayStation 3, Wii, and Xbox 360. It is the fifth installment in the Call of Duty video game series, excluding spin-offs. The game is set in the Pacific theater and Eastern front of World War II. The game is scheduled to ship in North America on November 11, 2008. Call of Duty: World at War will feature a more mature theme than previous installments in the series. Swimming elements will be introduced to the series for the first time in single player and multiplayer. While in water, the player cannot sprint and will only move at half speed. Flamethrowers, first introduced in Call of Duty: United Offensive, will be reintroduced with new flammable environments. The game will be slightly more open-ended than previous games in the series, as there will be multiple ways to complete missions. World at War will feature cooperative gameplay with up to four players via split-screen on consoles, or four players online, for the first time in the franchise. In addition, Wii will also feature multiple players on one screen. It will also use a perk system similar to Infinity Ward's Call of Duty 4. Activision has also confirmed the presence of vehicles in multiplayer. The story mode features two campaigns, one featuring the United States Marine Corps battling the Japanese Army in the Pacific, and the other following the Soviet Red Army on the Eastern European Front near the end of the war. One part of a level entitled "Makin Raid" shows an Allied prisoner of war being tortured by the Japanese before having his throat slit by a katana. The player's character witnesses this scene and is later rescued by U.S. Marines who liberate the camp. Two other levels were later revealed by IGN: one involves the player using the machine guns on a PBY Catalina to attack a Japanese naval fleet, and the other shows the beginning of the Russian campaign. In that level, the player and a Russian sniper attack German troops under the cover of a bombing raid. World at War will have an approximately two-year long development cycle, double that of Treyarch's previous title, Call of Duty 3. The game will be powered by an enhanced version of Infinity Ward's Call of Duty 4: Modern Warfare engine - improvements have been made to the physics model. Environments are now more destructible and can be set on fire with the flamethrower (which features propagating fire). Bullets can also cut holes in thin wood, making a gap big enough for the player to climb through. Kiefer Sutherland and Gary Oldman have been cast as voice actors for the game, the former taking the role of the main character, Sgt. Roebuck. A full-sized replica PBY Catalina was constructed for motion capture use.