Backstory
Starting here:
http://en.wikipedia.org/wiki/Tribes_(series)
Hits a bunch of games in vaguely chronological order:
http://en.wikipedia.org/wiki/Metaltech:_Earthsiege
http://en.wikipedia.org/wiki/Earthsiege_2
http://en.wikipedia.org/wiki/MissionForce:_CyberStorm
http://en.wikipedia.org/wiki/Cyberstorm_2:_Corporate_Wars
http://en.wikipedia.org/wiki/Starsiege
http://en.wikipedia.org/wiki/Starsiege:_Tribes
http://en.wikipedia.org/wiki/Tribes_2
http://en.wikipedia.org/wiki/Tribes:_Vengeance
膨大すぎるのでしばらく更新できないな、こりゃ