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1.
A huge series of anime and games that is based on an MMORPG called "The World." The .hack titles consist of, in order of the 'timeline'...

.hack//SIGN ...an anime
.hack//LIMINALITY ...an anime
.hack//INFECTION ...the first game in the series
.hack//MUTATION ...the second game
.hack//OUTBREAK ...the third game
.hack//QUARINTINE ...the final game
.hack//LEGEND OF THE TWILIGHT BRACELET ...an anime
The world of .hack could certainly be coming to us in another five years or so, when virtual reality is harnessed completely.
by Kyuubi No Kitsune May 27, 2005