Summit (S05E15)

The Tok'ra have learned of a planned meeting of System Lords at a highly-defended space station in neutral territory. Seeing this as a perfect opportunity to cripple the Goa'uld power base, the Tok'ra enlist the help of SG-1. Daniel goes undercover as a human servant to Lord Yu and gains entrance to the space station. Once on board, he is to wait until the last of the System Lords have gathered, then release a virulent chemical weapon that specifically targets symbiotes, wiping out all in attendance. All goes according to plan until an unexpected arrival threatens to jeopardize the entire mission. (Metro-Goldwyn-Mayer (MGM))