Judy and Nick investigate a case that leads them to an underground research lab with some shady animals who are protecting something.
They break in and find a high tech capsule that keeps a male human inside. Judy and Nick are freaked out for they had never seen a creature like that.
The human wakes up and goes on a feral drugged-like rampage throughout Zootopia.
Nick and Judy catch him and force on of the scientists to explain what is happening.
It is revealed that the world of Zootopia was left behind by humanity, who facing extinction do to environmental collapse, gave many animals the ability to think and reason. Zootopia was built on top of the lab that these scientists left behind.
The human comes back to reason and realizes he's been asleep for thousands of years. He finds the world of Zootopia amazing.
But soon the human, Nick and Judy become a target of some government organization that wanted to keep the secret of humanity hidden.
The movie leads up to a battle between the human and a big animal, maybe an elephant or one of the last apes, he becomes more like Tarzan, spear included, and manages to win by awakening some human fear deeply induced in the animal.
Nick and Judy manage to convince the police to apprehend the organization that keeps humans secret. Now that the secret of the origin of zootopia was out, the last human decides to travel the world in a bike and see how much things have changed. While Nick and Judy go back to normal and maybe begin to explore the possibility of a relationship.
But then, after the credits: The human is seen traveling on a bike on the road, he sees something that makes him stop immediately, in front of him appears what seems to be a human woman in a suit, the movie ends.