“Double Jeopardy” is twenty-one of season four of Stargate SG-1.
SG-1 are ambushed shortly after exiting a stargate, by someone who knows who they are, and who has met them before. Even though they have never visited before. They claim that they rose up against their Goa’uld overlord under SG-1’s urging, but Kronos arrived in his ship and re-conquered them.
This isn’t the SG-1 that Kronos was expecting though. They are the android copies of them that Harlan created in “Tin Man”. They do have their old guns, not the newer P90s the original team now uses. It seems the duplicates weren’t content to just hang around with Harlan. So SG-1 had been to the planet before. Harlan wants the original SG-1 to help their android duplicates to escape.