Summary: SG-1, Martouf/Lantash, and Jacob/Selmak had managed to escape from their Goa'uld holding cell, but Daniel was still delirious after the drugs he had been given to make him talk. While in this state, he finds a being - half-machine, half-living organism, billions of years old. It ends up sending him and his friends through time and space, to a future changed by their absence.
Crossover with: Star Trek: TOS (The Guardian of Forever) and Teen Wolf.
Spoilers: Star Trek: TOS, "The Guardian of Forever". Teen Wolf, up to and including the beginning of season 3 (though some events from that universe are AU here - Kate Argent is alive, among other things). Stargate SG-1, potentially all episodes, but mainly those concerning the Tok'ra and the Goa'uld Ba'al and Nirrti.
Uncensored (NC-17) rating on AO3 and Symbiotica. Story is edited for PG-13 rating on Fanfiction.net.