In a district court of Palakkad, Ananthan waits for a verdict regarding the heir of an isolated land. The lawyer informs Ananthan that the verdict was postponed for a time. Ananthan threatens Ani and his younger sister Aswathi as they too were competing for the land. Ani wants to find Hari, who was his cousin and childhood friend.Hari has been missing for seven years. He found his grandmother in tears most of the time and watching her, he decided that he must reach Hari somehow. For many years Ani has been searching for Hari. So when Ani recognizes Hari in a TV program featuring Punjab, he sets forth to Punjab with great expectations of finding Hari. In Punjab, he arrives in Mallu Street and finds Karthikeyan and Pappan. When they both came to know that Ani had come in search of Hari, they ask about the story of Hari. Then there is a flashback. In Kerala Hari wins a Kabbadi match and from then on all in the village were very fond of him. One day, Valiyampattu Raghavan Nair, Ani's father and Hari's uncle was carrying on with his harvest festival. But then arrived Govindan Kutty and Ananthan who had a grudge against Raghavan Nair's family. When Ananthan kicked the plate containing required items, Hari arrives at the spot. Govindan said that Raghavan Nair and Ani had come to seize property of Hari. When Hari ignored, Govindan Kutty warned Hari to be aware of Raghavan Nair as one day he will be kicked out. Hari decided to organise a new business in hope to earn some money but in vain. Ani decided to fix Hari's marriage with Aswathi in order to unite Hari and Raghavan Nair. Knowing this, Raghavan Nair slaps Ani for thinking a proposal for Aswathi with a jobless man. To get rid of burdens and humiliations Hari decides to leave the village for peace and promised a return after a long time. On his way he hears screaming of Raghavan Nair. When he was about to help him, Govindan Kutty and Ananthan accused Hari for killing own uncle for wealth. From then on Hari was never seen On hearing the story,Karthi and Pappan decides to help him find Hair and resolve his issues in Kerala. Still they were sure that it might not be Hari they knew as he was an entire Sikh. One day he finds Hari who fought the Sardar students for flirting with his sisters. Keen on seeing him, Ani enthusiastically called Hari loudly expecting for something good. But he is Harinder Singh, he spots a beard and turban and his attire is purely Punjabi. Even in his behavior, Harinder Singh looks a typical Punjabi. Ani came to know that Hari is Mallu Singh. Ani wants to make sure about Hari's identity and so decides to stay there for a long period. However Karthi and Pappan helped Ani. Together, the three go in search of proof to make sure that 'Mallu Singh' is Hari. Somewhere along the line, Suseelan joins the threesome making the situation worse. Suseelan came to Punjab to start a hair cutting salon but on finding that no one in Punjab cuts hair, took up cycle repair as his occupation for survival. Ani tries all his luck to make Hari reveal the truth. He even brings Ashwathi to Punjab. Even after Harinder Singh's marriage gets fixed with Ashwathi, Hari refuses to admit that he is Hari. Disheartened, Ani says that he is not ready for the marriage and they plan to go back to Kerala. Hari comes to their room and tells them that the real Harinder Singh was killed in an accident because Hari slept while driving his truck. Since he took Harinder Singh's role in their family, he cannot live as Hari anymore. Harinder singh's father hears this and says that Hari can live with them as their son but he has to go back to Kerala and settle his family problems. In Kerala, Ananthan plans the measurement of the land kept for verdict. A day pending for signature in court regarding land case, Ananthan confidently said his brothers that no one from Valiyampattu family would come to take back the land as Raghavan Nair got killed and Hari and Ani had too escaped. Then Hari, Ani, Karthi and Pappan comes to the spot and fights Ananthan and his brothers to get back their land and to avenge the death of Raghavan Nair. Once the things got settled, they move back to Punjab to get their brides married to them.
Cast
Unni Mukundan as Hari Narayanan / Harindar Singh aka Mallu Singh
Times of India gave it a two stars out of five. Sify.com stated "Mallu Singh could be appealing in parts for those viewers who are there just for fun, without much logic. For the rest, here is one movie with lots of style but no substance at all. Decide the category to which you belong, before heading for this one". Rediff.com gave a rating of 3/5, and stated that Mallu Singh is entertaining. Nowrunning.com gave a rating of 2.8/5, stating "Mallu Singh disappoints you on multiple levels; regarding the story, the script and above everything else in its failure to proffer its talented lead actor a challenging role that could have made a whole lot of a difference."
Box office
The film was commercial success. The film ran over 100 days.
