“Beachhead” is episode six of season nine of Stargate SG-1.
Some free Jaffa tell a Prior of the Ori that they are not interested in following his gods. When they try to kill him, they fail, and the Prior erects a shield around the stargate.
The SGC receive a message in Goa’uld, from a minor Goa’uld who served Ba’al. The Goa’uld, Nerus, is known as an inventor – rather unusual for the Goa’uld, who are more scavengers than inventors, taking technology from other races rather than making their own – and wants to work with the SGC. He is also well-known for his ‘appetites.’ He is quite disappointed that neither O’Neill nor Carter are present.
Nerus tells them about the Prior’s efforts, and wants to help them stop the Ori. Carter returns to help. With the stargate unable to be reached, they take the Prometheus there, with a really big bomb. The forcefield is increasing in size.
I think Walter (Chevron Guy) has been promoted and Daniel has shaved off his really unsuitable beard.