Thomas, alias Thorappan Thoma (Mukesh) and Pathira Thankappan (Sreenivasan) are two petty thieves working under Kottayam Kochunni (Jagathi Sreekumar), a notorious thief wanted by police. One day, to financially support Athapady Anthru (Mamukkoya), his master, Kochunni plans a big robbery at a hotel suite along with his disciples. On the same day, three young sons of Vikraman (Rajan P. Dev), a mafia don arrives in Kochi. K. R. (Prathapachandran), his business rival, plans to shoot down the children of Vikraman on same night at their hotel suite. But after getting the news, they wait for the killer to enter their room, heavily armed. Both Thorappan Thoma and Pathira Thankappan enter the same suite, and are attacked by them. In a bid to escape, both fight back. The commotion leads to chaos and police arrive. Thoma and Thankappan are tried for attempting to kill the sons of Vikraman and are sentenced to three years in jail. Kochunni and Andru escape from the scene.
Two years after the incident, Thankappan gets parole and absconds. Thoma is granted parole, but has been assigned to find out Thankappan in one week. Kochunni now runs an automobile shop, where Andru is a worker under him. Thoma arrives at Kochunni's shop in search of money. He is assigned to hand over a car at Chennai. Unknowing that the car belongs to the same Vikraman, Thoma sets out for Chennai. In the meantime, the elder son of Vikraman is shot dead by K. R. Vikraman suspects Thoma for this, who is now in Chennai. Accidentally, he happens to meet Thankappan, who is now married and is living under a new name, Shambhu Iyer. Both Thankappan and Thoma are now on run from police and Vikraman. The chase and fight to prove their innocence forms the rest of the story.
Cast
Mukesh as Thomas/Thorappan Thoma
Sreenivasan as Pathira Thankappan/ Shambhu Iyer
Jagathi Sreekumar as Kottayam Kochunni
Mamukkoya as Athappadi Anthru
Rajan P. Dev as Vikaraman
Prathapachandran as K. R.
Jagadish as Inspector Vincent d'Souza
Vijayaraghavan as Vikraman's elder son
Santhosh as Vikraman's second son
Ganesh Kumar as Vikraman's third son
Mala Aravindan as Professional Killer
Ramya Krishnan as Radhika
Suvarna Mathew as Mukesh's sister
Poojappura Ravi as Shambhu Iyer's Father in Law
Sharmili as Shambhu Iyer's Wife
Rajith Kumar as Hospital Attendant
Vinu Chakravarthy as Police Officer
