The story follows the life of hero Krishna Mehra a.k.a. Krrish, and his scientist father Rohit Mehra, who cope with cunning ruthless conspiracy set by the evil genius insane Kaal and his army of very dangerous beings led by female cruel Kaya. In the process, Krishna's pregnant wife Priya is kidnapped by Kaal and the form-changing Kaya takes her role at the Mehra home and eventually falls in love with Krishna.