 While exploring an alien stargate complex on P3R-233, Daniel Jackson finds an alien artifact that appears to be a mirror and touches it, receiving a mild jolt. No thinking anything of it, Daniel goes to find the rest of SG-1 who appear to have left him behind. Traveling to Earth, Daniel finds himself in an alternate reality where O Neill is the general in charge, Carter is a civilian scientist, Catherine Langford is the civilian head of the program, and where he never joined the program. What s worse is that the Goa uld are invading Earth, killing 1.5 billion people. With Teal c leading the Jaffa assault on Stargate Command, Daniel tries to escape through the stargate with information that might save his world from the fate of this alternate reality.