All Your History Are Belong To Us S01 E21 Valve Part 5: Game Changer

From Half-Life to Left 4 Dead 2, Valve has been one of the trailblazers in the video game industry. In this fifth episode of our retrospective, watch and see how Valve shook up the typical game production cycle by first releasing the short and quick Episode One, and then delivered the deal of the century with The Orange Box.