I just saw the pilot episode of Stargate SG-1 on Detroit's rerun channel "THIS-TV".
I had completely forgetten how the series started.
Amoured, cobra-head helmeted soldiers emerge from Earth's Stargate. Apophis, his head warrior Teal'c, and his Jaffa warriors have entered Stargate Command through the Stagte. Their bullet-resistant armour enables them to kill several airmen in a firefight while only taking two casualties of their own. They kidnap a female airman.
Major General George Hammond arrives with reinforcements, but he allows the intruders to flee through the gate when he sees Apophis has glowing eyes.
Soon afterwards, retired Colonel Jack O'Neill is re-called to Cheyenne Mountain Air Force Base by Hammond to tells what he knows about the aliens he encountered on the desert planet Abydos.
O'Neill finds his former teammates Captain Louis Ferretti
i and Sergeant Charles Kawalsky are also being questioned. The three men admit to have kept their secret, that Dr. Daniel Jackson is alive and living on Abydos because they believed that the alien threat had been dealt with.
Hammond sends the 3 men, plus astrophysicist Captain Samantha Carter through the Stargate to investigate the threat that the new aliens present.