Half-Life 2-Anticitizen One

Upon arriving in Kleiner's Lab after teleporting away from the Depot, Gordon Freeman and Alyx Vance discover they have been stuck in a teleport "loop" for approximately one week. They find that the teleport caused the destruction of Nova Prospekt, and the blow they struck there was taken as a sign to begin The Uprising. The two factions have been locked in combat for a week and all of City 17 is a warzone. Freeman goes on to aid in the battle, while Alyx remains in Kleiner's Lab to help him escape the city.