The Story of Valve Part Two

Developers of Half-Life 2 speak onstage during Spike TV's 10th annual Video Game Awards at Sony Pictures Studios on December 7, 2012 in Culver City, California. Jeff Kravitz/FilmMagic

Half-Life launched and co-founder Mike Harrington left Valve. What happened next to the company? We follow the story up to 2004.