R. Madhavan as Nambi Narayanan

Simran as Meena

Misha Ghoshal as Geeta Narayanan

Jagan as Scientist

Dinesh Prabhakar as L. D. Gopal

Ron Donachie as Col. Cleaver

Vincent Riotta as Luigi Crocco

Phyllis Logan as Mrs Cleaver

Gulshan Grover as A. P. J. Abdul Kalam

Ravi Raghavendra as Vikram Sarabhai

Shyam Renganathan as Shankar Narayanan

Karthik Kumar as P. M. Nayar

Mohan Raman as Udupi Ramachandra Rao

Sriram Parthasarathy as Barry Amaldev

Bijou Thaangjam as Studio Personnel

Rajeev Ravindranathan as Param

Sam Mohan as Unni

Bhawsheel Singh Sahni as Sartaj

Jack Dimich as Professor Eugene Scott

Karina Matas Piper as Michelle

Gaurav Venkatesh as Studio Personnel

Abhirami Venkatachalam as

James Eliya as Unni's Father in law

Suriya as Interviewer (Tamil version)

Shah Rukh Khan as Interviewer (Hindi version)

Muralidaran as Arunan