One idea could be to have a character from SG1 accidentally end up in the SGA universe and have to adapt to the new technology and threats there. For example, Jack O'Neill could find himself on Atlantis and his military tactics and dry humor would create interesting interactions with the Atlantis team.
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.
Combine the best traits of characters from both. For example, take Sheppard's leadership and piloting skills from SGA and mix them with Daniel Jackson's knowledge and curiosity from SG1. This creates a new and interesting character dynamic.
A possible plot could involve an immortal villain from the Highlander world using the Stargate network to spread chaos across different planets. The SG1 team, with the help of some friendly Highlander characters, has to track him down and stop him before he causes too much destruction.
One idea could be that the Death Eaters in Harry Potter form an alliance with the Goa'uld from Stargate SG1. The combined forces of dark magic and alien technology would be a huge threat. The heroes would then have to combine their skills, with the wizards using spells to counter the Goa'uld's energy weapons and the SG1 team using their military tactics against the Death Eaters. Another idea is that the Hogwarts students go on a field trip through the Stargate. They encounter various alien races and have to use their magic to survive and make friends. This could be a great way to show how magic can be applied in a completely different setting.
Well, there could be a fanfiction where Spike from BtVS gets beamed onto an SG1 adventure. He might initially be confused but then use his vampire skills to fight off some of the alien threats. There could also be a story where Daniel Jackson visits Sunnydale and tries to study the Hellmouth, and in the process, he and the Scooby Gang end up working together to stop a new threat that emerges from the combination of alien and demonic forces.
One interesting story could be about the characters from NCIS and SG - 1 teaming up to solve a mystery that involves both Earth - based crimes and alien technology. Maybe they have to track down a stolen alien weapon that is being sold on the black market on Earth.
One interesting story could be about how the characters from Highlander and SG1 team up to fight a common enemy that has the ability to travel between different dimensions. This would bring together the immortality concept from Highlander and the inter - galactic exploration of SG1.
Well, 'sga crossover fanfiction' typically involves taking the Stargate Atlantis (SGA) universe and crossing it over with elements from other shows, movies, or even books. It's a creative way for fans to blend different fictional worlds together. For example, someone might write a story where the characters from SGA meet characters from Star Trek. It can lead to really interesting and unique storylines.
One common theme is the clash of different cultures. The Sentinel has its own set of norms and the SGA universe has a whole different set with the various alien cultures in the Pegasus Galaxy. Another theme is the exploration of new powers. The Sentinel's powers in the context of SGA's advanced technology and alien threats can lead to some interesting storylines.
One great sg1 crossover fanfiction could be the ones that cross it with 'Star Trek'. In such stories, characters from SG1 might find themselves in the Star Trek universe facing new challenges and meeting different alien species. It's really interesting to see how the different technologies and cultures interact.