Stargate Command

Hidden deep inside Cheyenne Mountain lies a top secret government insulation. Here, there's a strange piece of alien technology, the Stargate. A device that can create a portal to countless distant planets. Some friendly, some hostile, some no longer inhabited. You stand at the foot of the ramp leading to the portal as a gate destination is entered into a computer in the control room. "Chevron six locked. Chevron seven is encoaded." (You are a trainee with the training team SG-13)