There are two ways that humans can enter Monster City without being in danger of becoming a meal. They must enter into slavery as a monster's pet, or they must wear a very cleaver monster disguise. Along with the disguise they must rub the juice of the monster berry on their skin to cover up the human scent. Once a human has entered in disguise they must tread very lightly. Most monsters don't trust humans, and the carnivorous monsters pay top dollar for prime cuts of human meat. Pet owners must take great care to protect their human pets from thieves.