The Broca Divide

O'Neill and the SG-1 team head through the Stargate to a planet known as P3X797 and discover a world divided between a dark and light side, those that live on the bright side, are humans, a Bronze Age people. Those who live on the dark side, are heavy browed primitives with limited skills.And as it is of little academic interest, the SG-1 team return.

All but Teal'c and Jackson, begin to develop the heavy brows and act with the animal brutality of the dark side people of P3X797. So do many others, including General Hammond. The whole project is in jeopardy, so Daniel and Teal'c head back through the Stargate, to try and discover the reason for their transformation. If they do not, will the team on the mountain remain trapped in the Stone Age?