Is it normal to have nightmares about zombies?

For instance I had one last night. I was at my grandmother's old house in my hometown with my mother and sibling. These zombies arrived and my mother told me to run. In another dream that I had a long time ago, I dreamt that I had alot of Pony (My Little Pony: Friendship is Magic) franchise (I used to be a fan of the show back then), and these Brony zombies were going to eat my brains unless I gave them all the toys, DVDs, Plush Toys, etc. I've had other dreams of zombies as well. I think I might have developed a small fear that zombies will one day roam the Earth and it'll be a huge nightmare for everyone. IIN?