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Kamal Haasan as 'Vasool Raja' Rajaraman Venkatraman |
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ప్రకాష్ రాజ్ as Dr. Vishwanathan |
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Prabhu as Vatti |
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Sneha as Janaki 'Paapu' Vishwanathan |
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Nagesh as Sriman Venkatraman |
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रोहिणी हट्टंगड़ी as Kasturi |
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Crazy Mohan as Professor Margabandhu |
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Karunas as Amit |
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Jayasurya as Zakir |
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Malavika as Priya |
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Ajay Rathnam as Medicine Professor |
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Kavithalaya Krishnan as Surgery Professor |
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Nithin Sathya as Neelakandan |
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Chitra Lakshmanan as Dr. Kalidas |
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Thalaivasal Vijay as Doctor |
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Santhana Bharathi as Gangadharan |
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Kaaka Radhakrishnan as Margabandhu's father |
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A. K. Veerasamy as Hospital cleaner |
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Madhan Bob as Mani Raja |
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Vaiyapuri as Piles Patient |
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E. Ramadoss as Ward Boy |
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Karate Raja as Raja's sidekick |
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Sampath Ram as Raja's sidekick |
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Meera Krishnan as Mani Raja's wife |
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Kaajal Pasupathi as Nurse |
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Boys Rajan as Professor |
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Yatin Karyekar as Anand |
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Benjamin as Pickpocket |
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Scisor Manogar as |
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Rathina Sabapathy as Swaminathan |
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Ragasiya as Self - Dancer |
| Sound | Kamal Haasan | Playback Singer |
| Sound | Bharadwaj | Original Music Composer |
| Writing | Vidhu Vinod Chopra | Original Story |
| Writing | Rajkumar Hirani | Original Story |
| Sound | KK | Playback Singer |
| Sound | Sadhana Sargam | Playback Singer |
| Sound | Sathyan Mahalingam | Playback Singer |
| Sound | Grace Karunas | Playback Singer |
| Sound | Bharadwaj | Playback Singer |
| Sound | Hariharan | Playback Singer |
| Sound | Shreya Ghoshal | Playback Singer |
| Writing | Vairamuthu | Lyricist |
| Directing | Saran | Director |
| Camera | A. Venkatesh | Director of Photography |
| Writing | Crazy Mohan | Dialogue |
| Production | K Murari | Executive Producer |
| Art | Mohana Mahendran | Art Direction |
| Editing | Suresh Urs | Editor |
| Production | A Manohar Prasad | Producer |
