You may be looking for Fusion, the fanfic genre that merges universes with characters from a different canon.
|Fandom:||The Sentinel/Stargate SG-1|
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From the publisher: "It's a simple but astonishing premise: Jim Ellison and Blair Sandburg are recruited by the United States Air Force, specifically to serve with Stargate Command — the SGC. Their work will take them off-planet and into danger's way, but Jim is a Sentinel ... and at this point, what the SGC needs is a Sentinel. In Toshua's last Sentinel novel with NHE, she took Jim and Blair to Alaska. But this time they are going much further. The planet is known to the Stargate team simply as PA 175, but they will come to know it intimately. 175 has a primitive human culture ... and the language they're speaking is a heavily-accented dialect of Chopec... Note that MERGING UNIVERSE is a non-slash work in which the pre-slash relationship can be seen building up to a result which will hopefully be in a future work!" [it wasn't]