From The Stargate Omnipedia
Believed to be designated as a medical unit, SG-8 is one of several Stargate Command teams that operate out of Cheyenne Mountain.
48 Hours - SG-8 is one of the teams prevented from returning to Earth when it is believed Tealc's pattern is stored in the Stargate's memory core. They are later brought home through Russia's Egyptian Stargate.
Zero Hour - SG-8 returns from P6J-908 with a plant which, though appearing innocent at first, soon begins to overrun the base.