The System Lords approach Earth for an alliance to stop Baal from conquering the galaxy. Teal'c and Carter travel to the Halla system to find the Asgard who are O'Neill's only hope.

O'Neill uses the memory of the Ancients to help the Asgard save their civilization once again.

Three deaths during a blackout lead Monk to a killer who was a '90s radical... and has been dead for a decade.

As Ed, Al and Marta continue their journey to Ishbal, they discuss the history and events that led up to the Isbalan Civil War. Through Marta, the brothers learn the truth behind the conflict. Meanwhile, Archer arrives at Lior to quell the new civil war.