Well, you could write a fanfiction where an unknown entity starts affecting the minds of the Space 1999 crew, causing them to have strange dreams and hallucinations that lead them to discover a hidden power source on the moon. Or perhaps a story about a new crew member who has a special ability that no one else on the base has, like the power to communicate telepathically with a particular alien species they encounter. Also, a plot about the moonbase facing a severe resource shortage and the crew having to make difficult decisions on how to ration and find new resources.
One idea could be exploring an alternate reality where the moon's journey through space leads it to a parallel universe filled with benevolent alien races that offer to help the moonbase inhabitants. Another could be a time - travel plot where the crew of Space 1999 travels back in time to Earth before the moon was blasted out of orbit and tries to prevent the cataclysm that sent them into space. A third idea might be a story focused on the personal relationships of the crew members during a long - term crisis situation on the moonbase.
One idea could be a group of dogs on a spaceship that discovers a new planet full of strange, dog - friendly creatures. They have to figure out how to communicate and coexist.
A plot could involve a time - traveling aspect within the fanfiction. For example, the characters go back in time to change a crucial event in the story and how that alters their present and future. This would add a whole new layer of complexity to their relationships and the overall story.
One idea could be that Ladybug and Chat Noir are sent to space on a mission to stop an alien villain who is stealing energy from planets. They have to adapt to zero - gravity combat and use their powers in new ways. For example, Ladybug's yo - yo could be used to grapple onto spaceships.
One idea could be exploring the backstories of the Power Rangers before they joined the team. For example, how did they discover their potential? Another could be a time - travel plot where they go back to a crucial moment in the history of their planet or the Power Rangers as a whole. Maybe they could meet their predecessors and learn from them.
Another plot could involve Mooncake getting lost in a strange dimension. Gary, being the loyal friend he is, sets out to find him. During his search, Gary discovers secrets about Mooncake's origin that he never knew before. This could lead to a deeper understanding of their friendship and the importance of Mooncake in the grand scheme of the Final Space universe.
One idea could be a crossover with Star Trek. The Yamato crew could encounter the USS Enterprise and have to work together to face a common enemy, like a powerful alien race that is threatening both their galaxies. They might have to learn from each other's technology and ways of handling situations.
One idea could be that the crew discovers a strange alien artifact while stranded. This artifact gives them the power to create temporary wormholes but with a great energy cost. They have to decide whether to use it to try to get home quickly or save the energy in case they need it for survival later.
One idea could be that the Tune Squad has to face an entirely new set of villains from different video games. For example, a group of super - smart AI characters who can manipulate the digital court in ways the Tune Squad has never seen. Another could be a story where LeBron James has to train a new rookie on the team, a young and inexperienced Tune, to be able to compete at the high level required in the game. Maybe this rookie has a special power that they don't know how to control yet.
One idea could be a story where Naruto discovers a new, ancient space - time jutsu that allows him to travel to alternate universes. In these universes, he meets different versions of his friends and enemies, and has to find a way to return home while also dealing with the chaos caused by the jutsu's power.
One idea could be Naruto using his time - control ability to go back in time and prevent the Uchiha massacre. This would completely change the course of the Naruto universe, leading to different alliances and power dynamics. For example, Sasuke might not have the same drive for revenge, and the Akatsuki's plans would be disrupted as Itachi would not be a rogue ninja.