One great Star Trek Battlestar crossover fanfiction is 'The United Fleet'. It combines the technological aspects of Star Trek with the gritty survival theme of Battlestar Galactica in a really engaging way. The characters from both universes interact in a believable manner, and the story has some great action sequences.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). They have a wide range of fanfictions, and you can use the search function to specifically look for Star Trek Battlestar crossovers. Just type in the relevant keywords, and you'll get a list of stories.
A lesser - known but very interesting 'Star Trek 2009 Crossover Fanfiction' is 'Star Trek 2009 Meets Firefly'. This one is special because it combines the high - tech future of Star Trek with the scrappy, Western - influenced world of Firefly. The contrast between the two settings makes for a very unique reading experience, and the author does a great job of creating a story that respects both source materials.
I really like 'TNG and Stargate SG - 1: The Unexpected Encounter'. In this fanfiction, the crew of the Enterprise - D from Star Trek TNG stumbles upon the Stargate. It's a fascinating read as it explores how the two different technologies and cultures would interact. There are some really cool moments where Picard has to negotiate with the Goa'uld, and Data tries to understand the Ancient technology.
One great 'Star Trek DS9 Crossover Fanfiction' is 'DS9 and the Enterprise Crew'. It combines the unique characters from DS9 with the more well - known Enterprise crew in an exciting adventure. The author does a great job of keeping the personalities of all the characters intact while creating a new and engaging story.
There's this amazing 'Battlestar Galactica 2003 Crossover Fanfiction' that combines it with the world of 'Firefly'. The space cowboy aesthetic of 'Firefly' meshes well with the more militaristic feel of 'Battlestar Galactica'. The fanfic focuses on the crews of both shows coming together to face a common threat in space. It has some great character moments and the action scenes are really well - written.
One great 'Battlestar Galactica Crossover Fanfiction' is the one that crosses it with 'Star Trek'. It imagines how the different technologies and cultures from both universes would interact. For example, the warp drive of 'Star Trek' and the FTL jumps of 'Battlestar Galactica' could lead to some really interesting scenarios in terms of space travel and exploration. The characters from both series also have different moral compasses, which makes for some great conflict and character development when they meet in this fan - made crossover universe.
Archive of Our Own (AO3) is a great place to find 'Star Trek Lower Decks Crossover Fanfiction'. It has a wide variety of stories written by different fans, and the tagging system makes it easy to search for specific crossovers.
One great 'Star Trek Star Wars Crossover Fanfic' is 'The Federation in the Galaxy Far, Far Away'. It combines the technological sophistication of Star Trek with the epic space opera feel of Star Wars. The story has the crew of the Enterprise finding themselves in the Star Wars universe and having to navigate the political and military landscapes there. It's a really exciting read for fans of both franchises.
Another option is to check out Star Trek fan forums. People there often discuss and recommend great fanfictions. They might even have dedicated threads for crossover fanfictions. You can also ask for suggestions directly in these forums. Some fans are really passionate about sharing their favorite reads.