Reckoning (2)

Ba'al sends his fleet back to retake the planet Dakara, pitting his ships against Teal'c and the Jaffa. The RepliCarter tries to probe Daniel's mind to find all the Ancients' knowledge, while Jacob and Carter discover the Ancient weapon on Dakara and try to figure out how to use it to destroy the Replicators. And on Earth, the Replicators overrun the SGC as Jack orders a nuclear strike.