SG-1 finds a planet inhabited by Native American Indians, protected by spirits who are actually advanced alien shapeshifters.

The Asgard aid Earth in negotiating a nonagression treaty with the Goa’uld System Lords.

SG-1 discovers a planet where children are used to acquire knowledge for the entire population, then discarded.

After gating to a world on the edge of a black hole, the S.G.C. cannot disengage the Stargate. All of Earth becomes endangered by the time-distorting gravity field.

SG-1 is imprisoned in a virtual reality realm and forced to relive the worst moments of their lives over and over.

Carter is possessed by a Goa’uld who claims to be an enemy of the System Lords.