One plot idea could be a joint case where the NCIS team and the NCIS LA team have to work together to solve a crime that spans across different locations. Maybe a terrorist threat that has connections in both Washington D.C. (where NCIS is based) and Los Angeles.
A possible plot could involve a missing person who has a connection to both Hawaii and LA's military. Hawaii Five - 0 starts the search in Hawaii and discovers that the person was last seen with some individuals who are under NCIS LA's surveillance. This leads to the two teams collaborating. They face many obstacles along the way, like interference from some powerful and shadowy organizations who don't want the person to be found.
One idea could be that the BAU is called in to help the NCIS LA team when a series of murders seem to be related to a military - civilian connection. The agents from both teams could clash at first due to different working styles, but then gradually learn from each other and solve the case together.
One great 'NCIS LA and NCIS Crossover Fanfiction' is 'The Joint Operation'. It combines the unique characters from both shows really well. The plot usually involves a case that requires the expertise of both teams. It shows how the agents from NCIS and NCIS LA interact, like how Gibbs' no - nonsense approach clashes and also gels with Hetty's more mysterious style of leadership.
One common theme is the cooperation between the two teams. Since they come from different but related agencies, the fanfictions often focus on how they learn to work together. For example, they might have to overcome differences in their investigative techniques.
One idea could be that a case starts in Hawaii and has connections to Los Angeles. The teams from both shows have to collaborate. Maybe a criminal organization is operating in both locations and they are smuggling some high - tech weapons. The characters from Hawaii Five 0 like Steve McGarrett could team up with the NCIS LA agents like G. Callen to take down the bad guys.
Well, perhaps Callen is poisoned during an investigation. He starts to feel ill and his symptoms get worse as the story progresses. His team has to figure out what he was poisoned with and find an antidote. Meanwhile, Callen is struggling to stay alive and keep his wits about him. It could be a race - against - time type of plot with lots of tension.
One reason is the expansion of the universe. By crossing over, fanfiction writers can explore new relationships between characters. They can put characters in situations that test their limits and abilities. Moreover, the fans are already attached to the characters from both shows. So when they are combined, it's like a dream come true. It gives a chance to see how the LA - based agents would handle a case that's more in the realm of the original NCIS and vice versa.
One popular NCIS and NCIS LA crossover fanfiction is 'Combined Forces'. It brings together the characters from both shows in an exciting case that spans across the two teams' jurisdictions. The story does a great job of capturing the personalities of each character, like Gibbs' no - nonsense attitude and Hetty's mysterious allure.
A scenario could be a missing person case that spans both areas. The NCIS LA team starts the investigation on the mainland when they realize the person might have headed to Hawaii. Then they call in the Hawaii 5 - 0 team for help. As they search, they discover that the missing person is involved in some sort of international conspiracy that both teams have to unravel.
One idea could be that the NCIS team is investigating a series of strange disappearances that turn out to be related to the experiments that created the Maximum Ride characters. The team could cross paths with the flock while trying to uncover the truth behind a shadowy organization involved in genetic manipulation.