General Hammond and the Pentagon are forced to reveal the existence of the Stargate to other world governments, and must defend the United States military's gate program.
So far there is an American and Russian Stargate program -– are there plans for any other countries to get involved at any point? As General Hammond mentioned the fact that China was asking questions about the downed Goa'uld mothership in this season's "Descent," it's quite possible that the Asian nation could become aware of the Stargate. On a grander scale, the title "Disclosure" implies the possibility that the gate could be made known even to the general public.
Guest characters for this episode include British Ambassador, Chinese Ambassador, French Ambassador and Russian Aide.
"Will the world be apprised of the existence of the Stargate? The consequences of 'Descent' did not go unnoticed by the world's powers, who convene. They are shocked to be apprised of the gate's existence, as well as the grave threat to Earth. However, a worse disaster could face everyone when it's proposed that control of the Stargate be handed over to a particular government agency . . . (guess who?)
['Disclosure' is] potentially a 'clip' episode, in which sequences from past episodes are interspersed with the episode. Look for the return of Major Davis, Colonel Chekov, and "someone who should have been dead." (SG1_Spoilme report)
"Hammond and Davis are in Washington, D.C. along with Colonel Chekov and Senator Kinsey (who's not dead after all - dam!) to meet with the French, British and Chinese Ambassadors and brief them on the Stargate program. None of them were buying the cover story that the Goa'uld ship that crashed off Alaska ("Descent") was really a Russian nuclear sub that's reactor went critical shortly after an asteroid crashed into the ocean in the area.
It has been decided by the U.S. and Russian governments to let the French, British and Chinese in on things and seek their help in readying a joint military venture to combat Anubis if it becomes necessary. Hammond, Davis and Chekov also try to convince the ambassadors that going public and letting the general population know about the Stargate would be a bad idea. The three ambassadors aren't happy. They don't like that the U.S. military is in charge of the program. Kinsey suggests handing the program over to the NID, which is a non-military organization.
None of the members of SG-1 seem to have any lines in this episode outside of the clips from previous episodes, unless they appear in the last two acts. The clips being used seem to go back all the way to Season One. This episode is very like the first season episode "Politics." For anyone who has missed a lot of the pivotal moments of the series, this episode looks like it will get them up to speed.
Good news for Daniel fans is that "a number of the clips they are planning to use have him in them." (GateWorld news report)