The intertwined stories of an international Don in Malaysia, David Billa, chased by the cops, an Indian police officer, a woman who wants to avenge the death of her brother, and a lowly thief, Velu who shares with Billa, an unusual connection.
Kathiresan aka Kaththi, a criminal, escapes from the Kolkata prison and comes to Chennai, where he comes across his doppelganger Jeevanandham, fighting for his life after being shot at by unknown men. Kathir decides to pass off as Jeeva and make away with a lump sum amount but once he realizes who Jeeva really is, Kathir turns a crusader.
Vinayak, a suspended cop, helps a group of four men rob cricket betting money amounting to 500 crores INR. When it comes to splitting the amount, betrayal hits the team hard and a chase ensues.
On a trippy day, the fates of 3 people - Vetri an aspiring filmmaker, Vasanth a reputed teacher and Selvam a corrupt and crooked cop collide, leading to various revelations, where Shree, an anxious youngster discovers that his girlfriend Parvathy has gone missing under mysterious circumstances, gives them the lead.
A Hindu man and a Muslim woman fall in love in a small village and move to Mumbai, where they have two children. However, growing religious tensions and erupting riots threaten to tear the family apart.
A professional assassin is tasked with the murder of a prominent local judge; however, after a series of failed attempts, he is forced to deal with complications and old relationships arising from his troubled past.
Ajay (Siddharth) comes to Kasi, where his thoughts and ideas on life and death undergo a sea change after he meets a young boy. He relocates to Chennai and stays in a house owned by a couple S V S Murthy (Mouli) and Jayam (Geetha). They treat him as their own son. A do-gooder, Ajay with his jovial nature wins the heart of all those whom he comes across. Vidya (Nithya Menen), a photo journalist meets Ajay and falls for his good nature. Ajay with the help of Vidya even gets street children obtain sponsorship for their education. But things take a turn when Vidya expresses her love to Ajay. He quietly walks off the place and decides to leave Chennai. But a rude accident to Vidya puts the responsibility on Ajay's shoulders to get her back to health. He takes her to USA for a surgery. Meanwhile a flashback reveals that Ajay was a successful doctor in the United States and who led a happy life.
Dhuruvan is a forest ranger, who is assigned the job of training five girls from the NCC camp. The group hears of a terrorist activity being carried out in the forest and makes a plan to defeat them.
A son decides to avenge his father, an army officer, who was falsely framed and killed by three corrupt officers. Fatefully, he also ends up falling in love with the daughter of one of the killers.
A brilliant medical practitioner finds himself at the centre of a murder plot after taking the daughter of a Russian Police Commissioner back to his hotel room.
Maya Bazaar is a place in a village called Mayannoor where people buy salvaged cars for their parts. Rameshan (Mammootty) is a leading man of the bazaar. With the money he earns, he feeds patients at the local hospital. A young girl who lives in Maya Bazaar called Maya loves Rameshan, but Rameshan does not have any feelings for her. Rameshan has a rival gang led by Bhadran (Kalabhavan Mani) and Bhadran wants to marry Maya.
Murugesan lives a life with no care in the world. Beats people up, sells his grandfather's land and incurs so much of his father's wrath that he's prophesied to meet a horrible end.
Jyothi Lingam, a bright student, leads a happy life in his small village. One day, tragedy strikes when his father, the only earning member of the family, dies in an accident.
Road journey of two people, a mentally challenged adult and an eight-year-old schoolboy, both in search of their respective mothers.
Shiva, a CBI officer, goes undercover as a student to hunt down a terrorist, John Chinnappa. However, the daughter of a crime witness, Pooja, has become John's next target and Shiva must protect her.
Kaalaiyan is a simple person and the best Jallikattu (Bullfight) player in his village. His world revolves around his four younger brothers. The antagonist is Varadharajan, a Zamindar from the neighbouring village who lives an extravagant lifestyle. His close aide is a transgender Saroja. Varadharajan's sister falls for the macho Kaalaiyan when he wins a Jallikattu. In the meantime, Bhuvana, on the run, after Varadharajan falls for her charm and tries to molest her, takes refuge in Kaalaiyan's house. However, Varadharajan decides to marry his sister to Kaalaiyan with an eye on his land. On the day of marriage, when Kaalaiyan comes to know that the bride wants to split the bond between the brothers, he calls off the marriage.
The unexpected meeting of two ex-lovers after a long time affect the equation of their respective families
Vinodh manipulates Thulasi into marrying him. Later, he takes away their firstborn child to please Satan by sacrificing it, however, Vijay, a kind man, saves the baby.
Arjunan Kadhali crux of the movie is love and the lovers who strive hard to succeed against the orthodox old generation. The story also deals with the influence love on basic pillar of relationships. Does love happens at first sight or not? Will the lovers adhere to their decisions against parents? How will they face crisis when people of their own society turn their back on them all because of love?
