Ethon

Ethon is the fifteenth episode of the ninth season of Stargate SG-1.

Plot
Stargate Command is contacted by Jared Kane from Tegalus, who reveals to them that his nation, the Rand Protectorate, was given an Ori satellite weapon and thus become followers of the Ori. The Caledonian Federation, which is engaged in a cold war with Rand, however refuses to follow the Ori. He tells them what he knows about the weapon and SG-1 agrees to help and use the Prometheus to destroy the satellite.

However upon their arrival, Kane and Daniel are imprisoned in Rand. The Prometheus tries to rescue Daniel but is caught in a firefight. They engage Rand's new space weapon, which was built by the Ori, but prove to be no match to its superior technology. They then try to destroy the satellite with the F-302s but they can't pass through the powerful energy shield and when the weapon fires again, the Prometheus is heavily damaged. SG-1 and most of the Prometheus's crew manage to evacuate to the surface before the ship is destroyed, taking its commander with it. In Caledonia, the team begins to hatch a new plan to destroy Rand's space weapon. Meanwhile, Daniel continues to try and convince Rand's president to solve the issue peacefully, but is ignored.

Back in Caledonia, Carter comes up with a plan to detonate equipment from an F-302 over the Rand command bunker to release an electromagnetic pulse and disrupt the systems controlling the space weapon. The plan is effective and while the systems are down, Mitchell and Teal'c move into position to destroy the space weapon. Realizing what will happen, Rand's president finally decides to make a deal with Caledonia, which was proposed to him by Daniel: He will give Caledonia the Stargate and any Caledonian that does not wish to believe in Origin would be allowed to leave the planet. Caledonia's prime minister grudgingly accepts the terms and Mitchell and Teal'c don't destroy the satellite. However when the control systems reactivate, Rand's president goes back on his word and orders the space weapon to destroy the Caledonian capital building. However, one of his commanders doesn't agree and shoots the president, and is in turn shot by his bodyguards. Jared steps in and convinces the Rand soldiers to stand down and deactivate the space weapon. When SG-1 leaves, both nations agree to try and solve their problems peacefully.

Unfortunately, shortly after SG-1 leaves the planet, peace talks between Rand and Caledonia break down, and both nations go into full scale war. All contact with the planet is lost, and both nations are presumed destroyed and the Stargate is presumed to be buried under the rubble.