While the Goa’uld threaten to attack Earth, SG-1 and the Asgard make a last, desperate stand against the Replicators, which have captured Major Carter and invaded the last outpost of…

Carter and Teal’c go in search of the Asgard to try and save Colonel O’Neill, but discover that the Asgard’s enemy has returned with a vengeance. The System Lords seek…