“Company of Thieves” is episode nine of season ten of Stargate SG-1.
Sam is on board the Odyssey which is looking for a rumoured second Ori supergate. When they get to the location, they don’t find a supergate, just a neutron star. And then three Lucian Alliance Ha’tak vessels. The Odyssey is quickly disabled and boarded.
The rest of SG-1 intend to go looking for it, but apparently there are no ships on hand, so Vala says she can acquire one for them. Which she does, and a very poor one it is. Then, whilst following up a lead, she and Daniel are both captured.
The new plan is for Mitchell to infiltrate the Lucian Alliance as an ally of the Alliance’s leader Netan who, conveniently, only Netan can recognise, using the chemical used by Daniel in “Summit” to convince Lord Yu that he was someone else.
They seem to be trying to build the Lucian Alliance into a potential future threat (they seem to be the major power filling in the gap left by the defeat of the Goa’uld System Lords), although as this is the last season, that probably doesn’t happen to the degree it could have. Even though the Alliance does appear in SGU as a threat, they don’t have a truly major role.