After losing Tealโc to Apophis (in the previous episode, Exodus), OโNeill, Carter, Daniel and Jacob find themselves aboard Cronusโ ship stranded in a remote part of the galaxy. As they are about to do battle with Apophisโ, a mysterious third ship appears, attacking their foe. This gives them the opportunity to escape, but Cronusโ ship has sustained serious damage to its control crystals and is not operating at full capacity.Back at SGC, Hammond receives news that the Tokโra Council believes SG-1 and Jacob were killed in the massive explosion that destroyed Apophisโ fleet. But Hammondโs not ready to write off SG-1 so easily.Apophisโ ship eventually catches up to SG-1โs ship, but sensors reveal there are no apparent signs of life there. With a plan to obtain control crystals, SG-1 transports onto Apophisโ ship. There they find many dead Jaffa as well as a programmed auto-destruct sequence in progress. Most astonishing is the reason for the shipsโ state: itโs infested with an army of replicator bugs, courtesy of the mysterious third ship.SG-1 narrowly escapes the bugs and the auto-destruct, making it back to their own ship. But no sooner do they arrive than a cargo ship appears on the sensors. They are overjoyed to see that itโs piloted by Tealโc: he had somehow escaped death on Apophisโ ship before it blew up. SG-1 rushes to meet him, only to find that he is in the company of Apophis, and that their biggest battle is about to take place.