Jaggu [Anushka Sharma] is a journalism student in Belgium. Post studies, she lands in India where Jaggu spots PK [Aamir Khan] for the first time. PK is a different boy who has doubts on everything that a human being does. His dressing sense is completely out of the box and then there grows friendship between Jaggu and PK. Both start the journey to find out why the world is like this and this forms the plot