Thalavattam Malayalam is a 1986 Malayalam drama film written and directed by Priyadarshan and starring Mohanlal, M. G. Soman and Karthika. The story is very loosely based on the American novel One Flew Over the Cuckoos Nest. Thalavattam was remade in Hindi as Kyon Ki in 2005 by Priyadarshan himself. The film was also remade in Tamil in 1988 by RobertRajasekhar as Manasukkul Mathappu with Prabhu and Saranya playing the lead.

With the help of Dr. Savithri Karthika, who is Dr. Ravindrans daughter, and Dr. Unnikrishnan Nedumudi Venu, Vinod slowly regains his memory and mental equilibrium. Savithri and Vinod fall in love. Dr. Ravindran has already arranged Savithris marriage with Hari Mukesh, so he opposes the lovers.When he finds that Savithri and Vinod are adamant, Dr. Ravindran lobotomises Vinod and puts him in a state of coma. Dr. Unnikrishnan feels that death would be preferable over a vegetative life and kills Vinod. He confronts Dr. Ravindran and confesses to the euthanasia. Savithri overhears the conversation, and loses her mental equilibrium. She is admitted into the same institution as a patient. ........

Source: Wikipedia