Samar Anand, a London-based struggling musician falls in love with Meera Thappar. After a severe accident, a panicked Meera promises God to leave Samar if he lives. Heartbroken, Samar leaves for India to become a fearless bomb disposal expert in the army.
| Actor | Role |
|---|---|
 Shah Rukh KhanMajor Samar Anand | Major Samar Anand |
 Katrina KaifMeera Thapar | Meera Thapar |
 Anushka SharmaAkira Rai | Akira Rai |
 SarikaDr. Zoya Ali Khan | Dr. Zoya Ali Khan |
 Andrew BicknellFrank | Frank |
 Sharib HashmiZain | Zain |
 Jasmine JardotMaria | Maria |
| GGireesh SahedevCaptain Jagdeep Deewan | Captain Jagdeep Deewan |
| AAmarinder SodhiCaptain Kamal Singh | Captain Kamal Singh |
 Varun ThakurLieutenant Hari Krishnan | Lieutenant Hari Krishnan |
| JJay ConroyRoger | Roger |
 Anupam KherMr. Thapar (Special Appearance) | Mr. Thapar (Special Appearance) |
 Rishi KapoorImraan (Special Appearance) | Imraan (Special Appearance) |
 Neetu SinghPooja (Special Appearance) | Pooja (Special Appearance) |
 Kumud PantBusinessman | Businessman |
 Jon WenningtonRestaurant Diner | Restaurant Diner |
 Julia St. JohnCatherine (Akira's Boss) | Catherine (Akira's Boss) |