Synopsis by Hal Erickson
On the devastated planet P35233, Daniel Jackson (Michael Shanks) comes upon a mirror-like alien artifact. Almost immediately, he is whisked into an alternate reality, in which he is no longer part of the Stargate program--and the earth is under attack from the Goa'ulds. Even worse, the Jaffa Teal'c (Christopher Judge) is still loyal to the Goa'ulds and is leading the attack. In his efforts to escape destruction, Jackson must also find a way to return to his own world and warn SG-1 of the horrors still to come.