Juggernaut is a game mode for private matches that appears in Call of Duty: Modern Warfare 3. There are two variations of the game, Team Juggernaut and Juggernaut.
The Juggernaut game mode is set up with every other player against one opponent (who is selected by random to be the first juggernaut). Everybody else must try to kill the Juggernaut; the player that ultimately kills the Juggernaut becomes the new Juggernaut. The Juggernaut's goal is to keep their position for as long as possible. The score system works much like Team Deathmatch, with every kill from the Juggernaut, they gain one point, and vice versa for the other team. Every kill gained as a Juggernaut is counted as a Juggernaut Kill and counts 150 points. The Juggernaut class, as well as the "Survivors" one, can be changed. When the Juggernaut is killed, the killer will gain the Juggernaut armor. The game ends when the Juggernaut achieves 20 kills (this can be changed).