Janakan movie is all about a villager Viswanathan (Suresh Gopi) who is a family man married to Nirmala (Kaveri) and is the father of a college going girl ( Priya). His best friends in the film are played by Biju Menon and Harisri Asokan.
Due to certain circumstances Viswanathan and his friends get involved in a murder, and they are on the run. The friends can be saved only by one man- Advocate Suryanarayanan (Mohanlal). In the film Mohanlal makes a 20 minute cameo appearance as the brilliant criminal lawyer.