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Kamal Haasan as Thenali Soman |
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Jayaram as Dr. Kailash |
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Devayani as Jalaja |
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Jyothika as Janaki |
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Delhi Ganesh as Dr. Panchabhootam |
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Charle as Kanthaswamy |
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Ramesh Khanna as Dr. Panchabhootam's Assistant |
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Madhan Bob as "Diamond" Babu |
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Crane Manohar as Servant |
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Lavanya as Raj TV Reporter |
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Bayilvan Ranganathan as Police Inspector |
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Mayilsamy as |
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Anoop Kumar as |
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Meena as Self (Cameo) |
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K. S. Ravikumar as Self (Cameo) |
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C. R. Vijayakumari as Mental Patient (Cameo) |
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B. H. Abdul Hameed as |
| Sound | Kamal Haasan | Playback Singer |
| Sound | A.R. Rahman | Original Music Composer |
| Production | R. Karpagam | Producer |
| Camera | Suresh Merlin | Still Photographer |
| Crew | Vikram Dharma | Stunt Coordinator |
| Writing | K. S. Ravikumar | Screenplay |
| Production | P.L. Thenappan | Co-Producer |
| Writing | Crazy Mohan | Dialogue |
| Sound | S. P. Balasubramaniam | Playback Singer |
| Sound | Hariharan | Playback Singer |
| Sound | Shankar Mahadevan | Playback Singer |
| Sound | Sharanya Srinivas | Playback Singer |
| Sound | K. S. Chithra | Playback Singer |
| Sound | Sujatha Mohan | Playback Singer |
| Sound | Chithra Iyer | Playback Singer |
| Sound | Sadhana Sargam | Playback Singer |
| Sound | Clinton Cerejo | Playback Singer |
| Sound | Gopika Poornima | Playback Singer |
| Writing | Piraisoodan | Lyricist |
| Writing | Arivumathi | Lyricist |
| Writing | Thamarai | Lyricist |
| Writing | Kalai Kumar | Lyricist |
| Writing | Ilayakamban | Lyricist |
| Art | Maniraj | Art Direction |
| Crew | B.H. Tharun Kumar | Choreographer |
| Directing | K. S. Ravikumar | Director |
| Camera | Priyan | Director of Photography |
| Writing | Pa. Vijay | Lyricist |
| Editing | Thanigachalam | Editor |
