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.
One possible plot could be that the survivors from both Z Nation and The Walking Dead meet by chance. They initially have some conflicts due to their different survival methods. For example, the group from Z Nation might be more open to using extreme measures against zombies, while the group from The Walking Dead has a more moral - centered approach. But as they face a huge horde of zombies together, they are forced to cooperate. They learn from each other's strengths and finally manage to defeat the horde and start to consider building a new community together.
Well, it could be about a group of survivors from Z Nation somehow finding their way into the world of The Walking Dead. Maybe they bring with them some of their unique ways of dealing with zombies, like the Murphy cure concept, and it causes chaos or new hope in the Walking Dead universe.
Definitely Murphy from Z Nation and Rick from The Walking Dead. Murphy has his unique zombie - human hybrid status which gives him some extraordinary abilities. Rick, on the other hand, is a natural leader. Putting them together would create a lot of interesting dynamics. They might clash because of their different leadership styles, but also might find common ground in their goal to protect their people.
Definitely Murphy from 'Z Nation' and Rick from 'The Walking Dead'. Murphy with his unique zombie - hybrid status and Rick as the natural leader. Their different leadership styles and views on survival would create a lot of interesting conflicts and cooperation moments.
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.
I think Murphy from Z Nation and Rick from The Walking Dead would be really interesting. Murphy has his whole zombie - like but still somewhat human situation going on, and Rick is a natural leader. Rick would be both intrigued and probably a bit wary of Murphy. Their interactions could be full of tension as Rick tries to figure out if Murphy can be trusted and if his 'condition' could be useful in some way against the walkers.
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.