In a last ditch effort, O'Neill activated an Ancient weapon in the Antarctic ...
Stargate SG-1
Season 8 Episode 16: Reckoning: Part 1
After a long absence, Jacob Carter returns to the SGC to tell Jack that the galaxy is under threat of takeover by the Replicators. The Goa'uld are under attack from the Replicators and are quickly being eliminated. Ba'al's armies are being...