In a last ditch effort, O'Neill activated an Ancient weapon in the Antarctic ...
Stargate SG-1
Season 8 Episode 20: Moebius: Part 2
SG-1 has changed the course of history and made the SGC virtually non-existent. Doctors Carter and Jackson have helped Brigadier General Hammond to find the Antarctic Stargate, but are not being allowed to help any further. They help Jack...