Another way is to join fanfiction communities or forums dedicated to either SGA or NCIS. Ask the members if they know of any good SGA NCIS crossover stories. They might be able to recommend some hidden gems that you wouldn't find through a simple search. Sometimes these communities also have their own collections or libraries of recommended fanfics.
Maybe there's a situation where an alien artifact is found on Earth that has a connection to Atlantis. The NCIS team starts investigating it, not fully understanding what it is at first. Then the SGA team gets involved because they recognize the technology. They work together to keep the artifact safe from various threats, both Earth - based and alien.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fan - created works, including many NCIS and NCIS LA crossovers. Just use the search function and type in relevant keywords to find what you're looking for.
Archive of Our Own (AO3) also has a good selection. It has a tagging system that makes it easy to find specific types of crossovers. You can look for tags like 'ncis sg1 crossover' and also narrow it down by other factors like the rating of the story or the relationships it focuses on.
Another option is to check out some NCIS or SWAK - specific fan forums. There, fans often share and recommend their favorite crossover fanfictions. You can join the discussions and ask for suggestions. Some forums might even have their own curated lists of great fanfictions that include crossovers between these two.
You can try fanfiction.net. It has a large collection of fan - made stories, and there are likely to be quite a few 'ncis ncis los angeles crossover fanfiction' pieces there.
You can also check out some dedicated NCIS fan forums. Sometimes, fans share their own crossover fanfictions on these forums, or they can point you in the right direction to find some really good ones. It might take a bit more digging, but it can be worth it for some unique finds.
You can find 'ncis and svu crossover fanfiction' on fanfiction.net. It has a large collection of stories that cross over these two popular shows. There are different genres and ratings available, so you can choose according to your preferences.
One good piece of 'sga crossover fanfiction' is the one where SGA characters cross over with the Mass Effect universe. It's really interesting to see how the different species and technologies interact. Another is the crossover with Firefly. The cultural differences between the two universes make for a great story.
You can start by searching on popular fanfiction websites. Websites like Archive of Our Own (AO3) have a large collection of NCIS fanfiction, including those with OCs. Just use the search bar and type in 'NCIS OC' and you'll get a list of relevant stories. You can then sort them by popularity or by the number of reviews to find the good ones.
Archive of Our Own (AO3) is also a great place. It has a very organized tagging system. So, when you search for 'ncis new orleans crossover fanfiction', it will show you all the relevant stories. Plus, the community on AO3 is really active, and you can interact with other fans who are into the same type of fanfiction.