A group of Hogwarts students could be on a field trip when they are suddenly transported to the world of The Walking Dead. Neville could use his knowledge of Herbology to find plants that might repel the walkers. Harry, being the leader, tries to keep everyone's spirits up and figure out a way back home. They come across a group of survivors led by Rick. At first, there is mistrust between the two groups, but as they face common threats from the walkers and some dark wizards who also end up in this world, they learn to work together.
Maybe Voldemort, in his search for ultimate power, discovers a way to control the walkers from The Walking Dead universe. He unleashes them upon the wizarding world. Harry and his friends then have to team up with some of the more badass survivors from The Walking Dead, like Daryl. Together they learn from each other's skills. The wizards teach the survivors some basic protection spells, and the survivors teach the wizards how to be more resourceful in a world without magic for supplies.
One possible plot could be that a spell gone wrong in the wizarding world accidentally opens a portal to the world of The Walking Dead. Harry Potter and his friends find themselves in this post - apocalyptic world. They use their magic to fight off the walkers, but also face moral dilemmas as they interact with the survivors who have no concept of magic. Hermione might try to find a scientific explanation for the walkers while Ron is more focused on survival and getting back home.
One possible plot could be that a powerful dark magic spell goes wrong in the Harry Potter world and creates a portal to the world of The Walking Dead. Harry, Hermione, and Ron find themselves in this post - apocalyptic world filled with walkers. They have to use their magic skills to survive, like using the Stunning Spell to immobilize walkers and the Fire - Making Charm to keep the walkers at bay at night. Meanwhile, some of the survivors from The Walking Dead world are in awe of their magic and start to learn from them, creating a unique bond between the two groups.
One possible plot could be that Voldemort uses the dark magic to create a plague similar to the one in The Walking Dead. The wizards and witches have to not only fight against the undead but also Voldemort's forces. Harry and his friends would need to find a way to stop the spread of the plague and defeat Voldemort once and for all, while also learning how to survive in a world filled with the walking dead.
Perhaps Voldemort somehow manages to bring the Left 4 Dead zombies into the wizarding world. The Order of the Phoenix and the Death Eaters are forced to team up to survive. The Death Eaters' dark magic might be used in new and unexpected ways against the zombies, and the Order's more defensive and protective spells would also be crucial. Harry, being the hero, could figure out a way to stop Voldemort from bringing in more zombies and find a way to send the existing ones back.
One possible plot could be that Zoey, who might be a survivor with unique skills like being an excellent tracker. She could cross paths with the main group from The Walking Dead. Maybe she has a cure or a lead on a safe haven that she's trying to reach. Along the way, she has to deal with the same undead threats and the complex human relationships that are characteristic of The Walking Dead world.
One possible plot could be that Batman finds himself in the world of The Walking Dead. He uses his detective skills to figure out the origin of the zombie outbreak. Maybe he teams up with some of the survivors like Rick. He'd use his gadgets to defend against the walkers. For example, his batarangs could be used to take out walkers from a distance.
One possible plot could be that the zombies from The Walking Dead somehow end up in the Naruto world. Naruto and his friends have to use their ninja skills to fight off the hordes of zombies. Maybe they could also try to find a cure using their knowledge of chakra and medical ninjutsu.
One possible plot could be that Inuyasha and his friends are somehow transported to the world of The Walking Dead. Inuyasha's sword, Tessaiga, could be effective against the zombies as it can cut through almost anything. They could team up with the survivors in the Walking Dead world. Kagome's spiritual powers might also be useful in detecting the zombies from a distance or even purifying them in some way.
One possibility could be that the dark magic in the Harry Potter world somehow creates a zombie - like plague similar to the one in The Walking Dead. Harry and his friends then have to use their magic skills not only to fight the dark wizards but also to survive the hordes of the undead. They might create magical barriers to keep the zombies out of Hogwarts.
Maybe the main characters of both shows meet in a post - apocalyptic city. The more science - minded characters from 'Z Nation' try to study the walkers from 'The Walking Dead' to see if there are differences in the virus strains. This leads to a series of adventures as they protect each other from zombie attacks during the research.
Well, one possibility could be a world where the magic from Harry Potter is used to combat the zombies in The Walking Dead. Maybe the wizards and witches from Harry Potter's world have to team up with the survivors in The Walking Dead universe. For example, they could use spells like the Patronus to ward off the zombies, which are drawn to negative emotions like Dementors. The Mashone aspect could perhaps be a new group of characters that have their own unique skills or magic that helps in this fight.