While SG1 attends the extraction ceremony of of the last ga’ul Ba’al, an ominous warning is issued… Ba’al explains he has a contingency plan in the event something like this ever happened…
(There is a scene in 1939 where Ba’al arrives through the stargate and takes over a freighter carrying the stargate, while it is being transported to the americas by sea)
During the cermony, Teal’c and Vala spontaneously disappear… O’Neil is then killed by Ba’al, and the remaining SG1 team (Carter, Mitchell, & Jackson,) frantically dial earth to escape, while all manner of people and buildings on the tokra world are vanishing one by one…

They go through the gate, only to arrive in the Cargo hold of the “Achilles…” the ship which was transporting the stargate to the americas in 1939, frozen in a block of ice…

…Realising they will soon freeze due to exposure… Mitchell uses a block of C4 to blast a way out, but his efforts also dislodge the frozen ship from the ice, and they have to struggle to escape the sinking and buckling ship…

While escaping the ship, Daniel’s leg is frozen, and his boot freezes so he can’t move. Sam and Mitchell leacve him & take off alone across the tundra discussing the paradox they find themselves in… They are picked up by O’Neil, (who in this timeline, is a special forces man…) and gives them a lift on a submarine that surfaces after he finds them…

They and Daniel Jackson are taken to isolation where they are inteviewed over and over again in a “24″-like montage… They all ask to speak to General Landry as someone who would “understand”…

(Retired) General Landry arrives, and grants them all witness protection, and new lives on the condition that they don’t contact each other or take jobs in their various professions… We find out Carter was an astronaught who died in a accident, Mitchell doesn’t exist, and Daniel Jackson is a recluse discredited for his insane theories that aliens visited ancient egypt, and the pyramids are landing platforms for alien ships.

(After a year passes,) Ba’al arrives with a massive fleet in tow, Taqesh as queen, and Teal’c as first prime… He appears to control all the Ga’ould.

Taqesh turns on Ba’al during the invasion and the bombarment of the earth gate and the ancient weapons platform in antarctica is ordered. After witnessing the death of Ba’al, Teal’c escapes to a cloaked Al-Kesh through the ring transported.

Taqesh orders the bombardment of earth from orbit, and she leaves through hyperspace with the mother-ship… Teal’c is forced to seek the japa-eye on earth to avenge Ba’al’s death at her hands, as it is the only way he can beat her to her destination…

Sam and Mitchell go to russia, where the second gate is… and arrive only shortly before Teal’c does in his Al-kesh. After a short stand-off, they decide to travel together to Ba’al’s secret failsafe… a stargate and ring platform, hidden away with a computer to calculate solar flare activity, thus allowing the wormhole to travel back through time by passing though a solar flare…

A firefight ensues as Katesh arrives and sends waves of Jafa through the rings… killing Teal’c, Daniel Jackson and Sam Carter in the process, leaving only Mitchell to traverse the stargate, and attempt to correct the past.

Katesh arrives just before Teal’c succumbs to his injuries saying she will take him as first prime, to which he answers “I don’t think so… I die free” then he drops a grenade to destroy the time-travel device, and all in the area…

Back in 1939, Cam thwarts the attempt to board the ‘achilles’ by shooting Ba’al and his Jafa as they come through the gate single file…

The scene goes back to the “removal ceremony” on the Tokra planet where, this time all goes as expected, and Vala stays behind to help Ba’al’s host cope with the traumatic experience of being removed from his symbiote, while O’Neil as usual, complains about being hungry.

Carter, Jackson and Mitchell discuss what the ominous message from Ba’al was all about, as we see a picture of Mitchell, standing with the captain of the “Achilles” in 1939 taped to the inside of his locker at the SGC.

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