An orphan soldier, Lieutenant Ram’s life changes, after he gets a letter from a girl named Sita. He meets her and love blossoms between them. When he comes back to his camp in Kashmir, he sends a letter to Sita which won’t reach her.
A prequel and sequel to Vishwaroopam, RAW Agent Major Wisam Ahmad Kashmiri is given the task to eliminate Al-Qaeda terrorist Omar Qureshi and his fellow jihadis, who plan to attack New York City.
Wisam and his team travel to the UK to perform final rites of their colleague Dawkins. Nirupama gets jealous of Ashmita’s closeness with Wisam and asks her how both are related. Wisam recalls his days in Indian Army where he finds young, enthusiastic and brave young lady officer Ashmita in a parade and award ceremony. Wisam and Colonel Jagannath together finalize Ashmita for their project and she is trained by Wisam. Wisam was chosen for the mission as he is an illegitimate son of a Pakistani and his mother is an Indian woman. Wisam and Ashmita create an impression that she is raped by him and Wisam is jailed for 10 years for having an affair with an army woman failing to his duties. Wisam is imprisoned but subsequently escapes from the prison with the help of Colonel Jagannath. Wisam is now stamped as a wanted terrorist and he along with Lieutenant Roy alias Imtiaz set for their mission to join Omar’s terrorist group.
Coming back to current, Wisam, Nirupama, Ashmita and Jagannath are received by Goswami, their fellow army officer, under the instructions of his superior Eshwar Iyer. On their way in the car to handover Dawkins’ mortal remains to his family, they are attacked by a group of terrorists and their car gets into a fatal accident. While Nirupama, Ashmita and Jagannath are trapped in the car, Wisam is thrown out. Wisam and his team are further tracked down by a terrorist and he engages in a duel to stop him and subsequently kills him. Goswami succumbs to the accident and dies happily seeing his enemy’s face which used to be his wish as an army officer.
Kavya and her friends plan to celebrate their New Year in Andaman. There they behave too notorious. While escaping from police for their deeds, Kavya hits a tribal named Jara with her car. Jara is heavily injured in the head. Kavya decides to save him by giving better treatment, so she brings him to Chennai. At first, there were too many misunderstands between them as Jara doesn’t know her language. After some time, she starts to train him, and a beautiful bond starts between them, in spite of not knowing their languages. Vicky, Kavya’s friend, tries to force on her, who is later saved by Vaasi (Jara). Vicky’s father is a billionaire who wants to punish Jara. Kavya tries to help Jara, but he is taken away to Andaman. Kavya too reaches Andaman. Rajashekar too goes to Andaman in search of Kavya, but she says she wants to stay with the tribe as she loves Jara and his way of living rather than city life. Jara and Kavya fall in love, and Rajashekar leaves them without punishing.
An elderly Malaysian man goes ballistic and kills several Indian officers in a span of 5 minutes at the Indian Embassy in Kuala Lumpur, Malaysia, before collapsing. A tattoo of a love symbol is present at the back of his neck, leading RAW officials to conclude that it is the handiwork of a criminal scientist named Love, whose identity and whereabouts are unknown to anyone except Akhilan Vinod (Vikram), a suspended RAW agent whose wife Meera George (Nayantara), a leading computer analyst at RAW, was killed by Love 4 years ago. RAW chief Malik (Nassar) tracks down Akhilan and convinces him to join the investigation. On viewing the video footage of the attack, Akhilan comes to the conclusion that the elderly Malaysian man had taken a mysterious performance-enhancing drug which allowed him to attack the Indian officials and decides to investigate the matter further in Malaysia. Since Akhilan is under suspension, Malik assigns him as a deputy to a junior RAW agent Aayushi (Nithya Menen), who is officially assigned to handle the case, and the two of them leave for Kuala Lumpur.
The film revolves around Alagar (Nataraj), who takes care of the family’s red chilli business. But he spends most of the time with his friends and leads a happy life till he comes across three brothers who control Madurai. He earns the wrath of the evil brothers while trying to save a girl called Thenmozhi (Poongothai). How our one man army successfully defeats the baddies and joins hands with his ladylove.
Vetriselvan (Sathyaraj) is an established and old-fashioned music director who is loved and respected for his works and is termed as the greatest musician of our times. A. K. Shiva (S. J. Surya), who works as an assistant under Vetriselvan, gets an opportunity to compose music for a small-time film. When he seeks permission from Vetriselvan to go ahead with his first venture as a music director, Vetriselvan does not oppose the idea as he would not have imagined even in his wildest dream that one day, Shiva would surpass him in the musical world. When Shiva introduces new techniques and pioneers the use of synthesizers, his music gets the attention of all music lovers. Due to the freshness and modernity his music possesses, he becomes the most sought after musician and overtakes Vetriselvan. Shiva becomes the number one musician and builds his own studio. Meanwhile, he falls in love with Jenny (Sulagna Panigrahi) and marries her. When it seems everything he touches turns to gold, Vetriselvan displays his psychopathic form. To get his glory back, Vetriselvan does whatever it takes to label Shiva unfit to compose music. Can Shiva bounce back despite his new and unwanted status forms the rest of the story.