Zombie attack (a billdip au)

I got this story idea from a one shot I read a while back. This is also my first story on here so it may suck a little. The first chapter and probably the second will be close to the one shot. So Gravity Falls is being taken over by zombies. There are very few people left those people include Bill Cipher and Dipper pines. Bill is a normal person but he has some powers, Dipper is the same nerdy guy we all know and love. Can the two save the town with the help of friends and make it out alive, or will they fail and never see peace? (Bill is 17 while Dipper is 16)