Episode #19 leads off the final three episodes.

In the final three episodes the first is called There But For The Grace Of God. In this episode Daniel while exploring some alien cultures' collection of artifacts uses some device and activates a kind of mirror. He touches it and is sent to a parallel dimension. He finds himself alone on the planet they had just gone too.

Meanwhile just before he is separated, Tilk tells Jack that a symbol they find means that this world has been completely destroyed by the Goa'uld. Tilk warns Jack they must leave immediately.

So Daniel separated in the parallel world and alone, returns through the stargate and finds the SG-C on a parallel world. In this SG-C roles are changed slightly. In this parallel world the Daniel here is not even part of the SG-1 and in fact Kathryn does all the decoding, Jack is the base commander and Sam is a civilian Astro Physicist who is engaged to Jack. In this SG-C the Goa'uld are destroying the planet. After Daniel figures out that the annihilation fate of this parallel world will happen to earth, he talks the parallel world Jack into letting him return through the gate. Jack, at Daniel's suggestion of his Tilk's attitudes, attempts to reason with the parallel world Tilk who will have none of it.

This is actually the last time the gate can be used in this parallel world as the parallel world self destructs the SG-C as Tilk and Goa'uld have won the battle. The parallel world is destroyed by the Goa'uld. Daniel returns to the first world SG-C and the show ends to be continued. He also returns with gate coordinates for the world where the Goa'uld will launch their attack.