Rohit and Nisha are married and they have a kid. They both die in a car accident. The kid starts growing up in his grand mother care. As he is growing up he discovers that he has superpowers (in Koi Mil Gaya Jadoo transferred his powers into Rohit, which apparently went to his son). The movie basically shows how he deals with his power and save the world from a villain (Naseeruddin Shah).

Krrish Mehra (Hrithik Roshan) is a man with extraordinary strength, speed and intelligence. He loves the calmness and beauty of natural mountainous and surroundings where he is living. He comes across Priya (Priyanka Chopra), a beautiful girl from Singapore, who has come there for camping and trekking and falls in love with her. Krrish is left heart broken when she finally has to leave for Singapore. When Sonia, Krrish grandmother (Rekha) sees how lonely he has become, she encourages him to go to Singapore and woo Priya back.

Krrish reach Singapore and finds it a completely new and fascinating world. He learns fast and adapts to it quickly. He makes new Chinese friends in Singapore and woos Priya. In one of the songs, the atmosphere is that of a carnival where most of the people are wearing masks of different kinds. The song continues into a circus, there a short circuit happens and the tent of the circus catches fire. The circus performers get stranded on top and start screaming for help. Krrish realizes that he can help them. He sees a slightly broken burnt Mask lying on the ground nearby. He dons the mask for hiding his identity and save them in a spectacular manner. This heroic deed makes the ‘Masked Man‘ a hero and a nationwide search is launched for this new hero in Singapore.