“The Broca Divide” is episode five of season one of Stargate SG-1.
“The Enemy Within” is episode three of season one of Stargate SG-1.
“Children of the Gods: Part 2” is episode two of season one of Stargate SG-1.
“Children of the Gods: Part 1” is episode one of season one of Stargate SG-1.
Stargate SG-1 was the first spin-off series in the franchise from the Stargate film, and started three years after the release of the film. The stargate itself had been kept in storage since the events of Stargate, but it suddenly activates and a force of human-looking aliens come through it. This intrusion results in the creation of Stargate Command – the name being used for both the organisation, and for the base in the Cheyenne Mountain complex itself – and the SG teams who are sent through the stargate to explore the new worlds and, hopefully, bring back some useful technology to help protect Earth. SG-1 is the first of these teams.