SG-1 discovers a device on a planet, Madrona, called the Touchstone which seems to have the ability to regulate the weather. SG-1 gets permission to stay on the planet to study the device but when they return it has been stolen and the Madronans blame SG-1.

SG-10 is on a planet when its sun becomes a black hole, and the Stargate link back to Earth threatens to destroy first Stargate Command and then the entire planet.