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Rajinikanth as Dr. Vaseegaran / Chitti |
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Aishwarya Rai Bachchan as Sana |
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Danny Denzongpa as Dr Bohra |
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Santhanam as Siva |
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Karunas as Ravi |
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Devadarshini as Latha |
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Sabu Cyril as Agent Shah |
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Kalabhavan Mani as Pachaimuthu |
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Cochin Haneefa as Traffic Police |
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Raaghav as Neighbourhood Bully |
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Boxer Dheena as Thug |
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Shriya Sharma as Curious Student |
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Sugunthan as Police Inspector |
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Delhi Kumar as Vaseegaran's Father |
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Revathi Sankaran as Vaseegaran's mother |
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Chaams as Barber |
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Devadasu Kanakala as K. Bhajanlal |
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Rekha Suresh as |
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Savitha Reddy as Sana (voice) |
| Costume & Make-Up | Manish Malhotra | Costume Design |
| Costume & Make-Up | Mary E. Vogt | Costume Design |
| Crew | 袁和平 | Stunt Coordinator |
| Writing | Vairamuthu | Lyricist |
| Writing | Madhan Karky | Lyricist |
| Writing | Pa. Vijay | Lyricist |
| Sound | S. P. Balasubramaniam | Playback Singer |
| Sound | A.R. Rahman | Playback Singer |
| Sound | Khatija Rahman | Playback Singer |
| Sound | Yogi B | Playback Singer |
| Sound | Keerthi Sagathia | Playback Singer |
| Sound | Shweta Mohan | Playback Singer |
| Sound | Tanvi Shah | Playback Singer |
| Writing | Lady Kash | Lyricist |
| Writing | Krissy | Lyricist |
| Sound | Lady Kash | Playback Singer |
| Sound | Krissy | Playback Singer |
| Sound | Vijay Prakash | Playback Singer |
| Sound | Shreya Ghoshal | Playback Singer |
| Sound | Pradeep Kumar | Playback Singer |
| Sound | Pravin Mani | Playback Singer |
| Sound | Javed Ali | Playback Singer |
| Sound | Chinmayi Sripaada | Playback Singer |
| Sound | Hariharan | Playback Singer |
| Sound | Sadhana Sargam | Playback Singer |
| Sound | Benny Dayal | Playback Singer |
| Sound | Naresh Iyer | Playback Singer |
| Crew | Kamal Haasan | Thanks |
| Directing | Shankar | Director |
| Writing | Sujatha Rangarajan | Story |
| Sound | A.R. Rahman | Original Music Composer |
| Writing | Shankar | Story |
| Writing | Shankar | Screenplay |
| Writing | Shankar | Dialogue |
| Writing | Sujatha Rangarajan | Dialogue |
| Writing | Madhan Karky | Dialogue |
| Production | Kalanithi Maran | Producer |
| Camera | R. Ratnavelu | Director of Photography |
| Editing | Anthony | Editor |
| Art | Santosh Kotkar | Art Direction |
| Crew | Peter Hein | Stunts Coordinator |
| Crew | Raju Sundaram | Choreographer |
| Crew | Dinesh Shikari | Choreographer |
| Crew | Shobi Paulraj | Choreographer |
| Crew | Prabhu Deva | Choreographer |
| Directing | Atlee | Assistant Director |
| Directing | Karthik G. Krish | Assistant Director |
| Visual Effects | 鍾智行 | Visual Effects Supervisor |
| Art | Sabu Cyril | Art Direction |
