"Prologue" was a canceled Call of Duty: World at War level. The code of this level can be found in Mod Tools, some animations and textures for this level is remaining in the Mod Tools.
The place is dark. An Officer wakes up the player, and tells them that they are low on ammo and are awaiting reinforcements. There is a noise and a scout goes out to investigate. After a thump is heard, the officer whispers the scout's name several times and a flare is sent up. The first wave of Japanese troops attack. The Americans defend themselves and repulse the attack. A second and third wave comes in, led by two officers with swords, in which the Americans get overrun. The player either runs out of ammunition or a timer runs out, when he is warned of someone behind him, and the player is decapitated from behind, killing them, with the screen going dark.