Half-Life 2

Following the period of instability caused by the events described in Half-Life, an interdimensional organization known as the Combine invades the Earth, defeating the human forces in the Seven Hour War. A Combine Citadel is erected in City 17, a town in Eastern Europe reminiscent of World War II ghettos. Dr. Wallace Breen, a human scientist, rules the city on behalf of his new masters. An energy field prevents humans from procreating, and no new children are born. Earth is turning into a grim, ...