One possible plot is that a mysterious signal is being sent across the universe, and only the Doctors can detect it. When they all meet, they realize that it's a call for help from a long - lost civilization that was once an ally of the Time Lords. To reach this civilization, they have to navigate through a series of dangerous time - locked zones. Along the way, they encounter old enemies who have also been drawn to the signal. The Doctors must rely on each other's strengths, whether it's the First Doctor's wisdom, the Tenth Doctor's charm, or the Thirteenth Doctor's determination, to overcome the obstacles and save the civilization.
The plot might center around a time rift that pulls all 14 Doctors together. They then discover that a powerful time - traveling race is trying to rewrite history for their own gain. The Doctors would form a council of sorts, sharing their experiences and wisdom. Some Doctors might be initially reluctant to work together, leading to internal conflicts. But eventually, they would put aside their differences and use their sonic screwdrivers and TARDISes in creative ways to stop the villains and restore the proper flow of time.
One possible plot could be a grand tournament. All the assassins gather in a secret location. They compete in various challenges, not just about killing but also stealth, strategy, and survival skills. This would allow for different assassin characters to show off their unique abilities and techniques.
Obviously, all 14 Doctors are the main characters. Each with their own distinct personalities, from the wise and somewhat eccentric First Doctor to the energetic and compassionate Thirteenth Doctor. Their companions could also play important roles. For example, Rose Tyler might accompany the Ninth or Tenth Doctor, and Clara Oswald could be with the Eleventh or Twelfth Doctor. And of course, the Doctors' archenemies like the Daleks or the Cybermen could make appearances as antagonists, which would further drive the story as the Doctors work together to defeat them.
One possible plot could be that the Avengers are on a mission in a realm where they accidentally stumble upon Sleipnir. They initially mistake it for a threat but then realize it has its own intelligence and might be an ally. Maybe Sleipnir can help them travel through different dimensions to stop a greater evil that is spreading across the multiverse.
Perhaps they meet in a post - apocalyptic world where they are the only ones left with medical knowledge. They have to combine their skills to save the remaining survivors. They might face shortages of medical supplies and have to improvise treatments, which could lead to some interesting character development and conflicts among them.
One possible plot could be that during the regeneration process of the 9th Doctor, something goes awry with the Time Lord's normal regeneration cycle. Maybe there's interference from an outside force, like a powerful alien entity that wants to disrupt the natural order. This interference causes the regeneration to skip a few incarnations and directly jump to the 11th Doctor. The new 11th Doctor then has to deal with the after - effects of this abnormal regeneration. He might have some strange memories or abilities that are a mix of what the 9th Doctor was supposed to pass on and some new, unexpected elements.
The plot could revolve around a tournament. Arthur's friends are there to support him, and Merlin is there to assist Arthur. When Arthur's friends see how Merlin is always there for Arthur, getting his gear ready, giving him advice, and even using his magic subtly to help Arthur in the tournament, they start to take an interest in Merlin.
Well, perhaps the patient is in a coma and the doctor is constantly by their side, talking to them, sharing stories. As the patient slowly shows signs of waking up, the doctor's care and dedication start to turn into something more. They then embark on a journey of getting to know each other on a deeper level once the patient fully recovers.
The plot could start with Naruto discovering an ancient art of witch doctoring. He might find a hidden scroll or meet an old hermit who teaches him. Then, he uses his new skills to heal his friends who were injured in a battle. For example, he could create a special potion to revive a nearly dead comrade. As he delves deeper, he realizes that there are dark forces at work that only his witch doctor skills can combat.
Maybe Harry becomes an assistant to the doctor and they go on adventures through time and space. They might encounter various alien species and solve mysteries together.
In a 'bill and fleur first meet fanfic', perhaps they meet at a magical event like a wizarding festival. Fleur could be there representing Beauxbatons, and Bill, being a Curse - Breaker for Gringotts, might be on some sort of business related to the event. Their eyes meet across a crowded tent filled with magical artifacts and spells, and there's an instant spark of curiosity.