Tribes is a game series that follows along the Earthsiege and Starsiege storylines, and so is part of a long history of other games with storylines that build off of each other. In addition to the Main Games, the following games are also connected to the wider Tribes universe.
Stellar 7 (1990)
Nova 9: Return of Gir Draxon (1991)
Stellar 7: Draxon's Revenge (1993)
Metaltech: Battledrome (1994)
Metaltech: Earthsiege (1994)
Earthsiege 2 (1995)
MissionForce: CyberStorm (1996)
Hunter Hunted (1996)
CyberStorm 2: Corporate Wars (1998)
Starsiege (1999)
Tribes Extreme (1999 - Cancelled)
Starsiege: 2845 (2006 - Cancelled)
PlayTribes (2010 - Cancelled)
Tribes Universe (Presumed cancelled)
Tribes Royale (Presumed cancelled)
Starsiege: Raiders (Possibly cancelled)