Teal'c means to stop the ceremony that will turn his son into a slave my being impregnated by a Gao'uld. The SG team heads bake to Chulak in hopes of freeing Teal'cs family and find there is a small group of Jaffa' that are starting to resist the Gao'uld ruler. Enter Bra'tac, a Jaffa Master and high ranking warrior. someone we will see much more of in the future.
As you can tell this is a Teal'c centered episode written to build and flesh out the character and give him some balance and meaning