December 30, 1941. In Vyazma (‘Vyazemsky cauldron’) there is a small group of Soviet soldiers, who are trying to reach their own comrades after having escaped a Nazi encirclement. In the movie they are suddenly caught in an unequal battle with a special unit of the Wehrmacht. None of these brave people was born a hero but they became heroes. And were helped in their battle by the Red Ghost. The myth of the red ghost of the movie is about a lone hero who picks off Nazi soldiers one by one. He seems to be able to vanish almost magically into the forests and even to come back from the dead.

Ramanaa begins with the abduction of fifteen District collectors. After three days in captivity, fourteen officers are released, but one is murdered. The police find a tape recording and a file on the dead officer’s body that provide significant evidence concerning the kidnapping and subsequent murder. The file suggests that the crimes were committed by members of the self-proclaimed “Anti-Corruption Force” (A.C.F.), a citizen militia seeking to eliminate corruption through vigilante acts. The militia, acting as a kangaroo court, “sentenced” corrupt officials in the area to death, beginning with the captured revenue officers who were apparently engaging in criminal activity.

Saravanan (Sarathkumar) is a bus driver in a college. He also takes care of an orphanage which is home to numerous children and old-aged people. Indhu (Nikita Thukral), a student of the college, tries to woo Saravanan, while rowdies and other antisocial elements in the city are found dead. Chakravarthy (Mahadevan), the politico who loses his right-hand man, vows revenge and realizes Saravanan, who killed his henchmen, is an Army Major whom he and his men had eliminated years ago in a scuffle over his sister’s (Saranya) land. How Saravanan fends off the evil elements and unites with Indhu forms the rest of the story.

Aarumugam (Suriya) is a thug and dealmaker with a band of boys handpicked from the slums of Chennai. Aaru’s mentor Vishwanathan (Ashish Vidyarthi) protects him because Aaru gives him the violent undercover he needs. When Vishwanathan declares war on his bitter rival Reddy (Jaya Prakash Reddy), Aaru assists him. But Vishwanathan betrays him, resulting in Aaru’s subordinates’ deaths. Aaru realizes Vishwanathan’s true, evil nature and vows to destroy his power. There is also a subplot involving Aaru’s romance with the college student Mahalakshmi (Trisha).

The story opens in the British India reign, where a British man and porter are trying to catch a ferry. On the way, however, one of the suitcases being carried by the porter falls and opens, revealing many diamonds. The porter steals some of the diamonds and sends the gentleman on his way. He hides these diamonds in a trunk, which he buries near a temple in the Gulaebaghavali village. The story then shifts to 2018, where Badri (Prabhu Deva) and his boss Nambi (Mansoor Ali Khan) perform petty thefts. While at a pub, Badri spots Viji (Hansika Motwani) and falls for her. Soon, Badri unknowingly accepts to steal a priceless statue from the temple at Gulaebagavali and runs into Viji. The duo escapes from the villagers. With some help from Munish (Ramdoss) and Maasha (Revathi), they steal the trunk, which reveals a skeleton. After a lot of confusion, the trunk is delivered, where it is revealed that the diamonds are stored in the skeleton. The police comes to the spot and finds that the diamonds were very valuable. After they escape from the police, it is revealed that during the fight, a hand of the skeleton fell in Maasha’s car. On finding this out and how Maasha tried to deceive the other three, the trio chases her. A parallel storyline involves Mayilvaganam (Sathyan) and a don Annachi (Rajendran), which culminates in the climax.

The film starts with a tough debate in the new Andhra Pradesh state assembly about the long pending murder case of Visakhapatnam City Police Commissioner Ramakrishna IPS (Jayaprakash). The Home Minister of Andhra Pradesh, K. Sathyanarayana Reddy (Sarath Babu) proposes to bring DCP Durai Singam (Suriya) from Tamil Nadu police to solve the long pending case. Durai Singam learns about Madhusudhana Reddy (Sharat Saxena), a don ruling Andhra Pradesh and gives a casual impression under a disguise after facing some attacks, while he secretly investigates the case from all aspects. Meanwhile, Durai Singam is being followed by Vidya (Shruti Haasan) who is a journalist under cover, tracking Durai Singam in a disguise as IPS student named Vidhya. Durai Singam states he has divorced his wife, Kavya (Anushka Shetty), but secretly contacts her. Later, after suspicions about this were made by his colleague, Subba Rao, who is an Inspector of Police and seen Durai Singam with Kavya, he discloses the divorce cover up as an intent to keep Kavya away from his enemies.

Kannan (Mammootty) is a sincere district collector. A female leader of a major political party is kidnapped by terrorist Veeraiyan (Nassar), and he promises to return her back if his injured brother Arasappan (Napoleon) is treated well and brought back safely. The government agrees to this condition and asks Kannan to look after Arasappan. At first, Arasappan hates Kannan and his family as Kannan works for the government against whom his brother’s group is rebelling, but the kindness shown by Kannan’s wife and mother change his attitude. Just when he was about to turn over a new leaf, a bad thing occurs. The police team, without taking the necessary orders from Kannan, go to the forest and attack Veeraiyan’s gathering. This angers Arasappan, but he was restrained by Kannan. the police accuses Kannan of having links with the terrorists as Arasappan ran away from his house and Kannan condemned the police action; hence, they arrest Kannan’s wife and mother (Kannan ran away to find Arasappan). Hearing this sad news, Arasappan surrenders to the police as he did not want them to suffer for him, but the police do not spare him despite his surrender.

A voice-over by RD (Anil Kapoor) introduces the four main characters: Ranvir Singh “Ronny” (Saif Ali Khan) who runs a successful business he inherited from his father. His younger brother Rajiv Singh (Akshaye Khanna) who mooches off of Ronny and is an alcoholic. Ronny is dating an upcoming model Sonia (Bipasha Basu), while his personal assistant Sophia (Katrina Kaif) appears to be secretly in love with him. Ronny is also involved in an intense competition with a rival horse-owner Kabir (Dalip Tahil). The film opens with a murder plot involving a car accident which Ronny narrowly survives. When Ronny loses money in a race because his jockey had been bribed by Kabir, Ronny plants a bomb in the jockey’s car and kills him, showing Ronny to be a ruthless businessman. Later, Ronny also destroys Kabir when the latter offers him money to buy his business, which is in debt.

Ramana ,a college professor attempts to end corruption by creating a group called ACF.

An asteroid strikes the Ennore neighborhood of Chennai. Astronauts predict that another asteroid will hit India within six days. The R&AW decides to send Vasu (Jayam Ravi), a trained magician and escape artist, along with his team and a team of scientists to get ahold of a missile in a space center, which they plan to use to destroy the asteroid. The military also catches Venkat (Ramesh Thilak) and Appu (Arjunan), two of Vasu’s friends. Vasu, Venkat, and Appu are alerted about the asteroid, and they have to steal a nuclear missile from a Chinese space station. The mission is disguised as a satellite maintenance project. Vasu meets Swathi (Nivetha Pethuraj) and Raguram (Vincent Asokan), two army officials who are going on the mission with them. Vasu, Swathi, Venkat, Appu, and Raguram go on the space shuttle Dhruva-1. Just before launch, Vasu’s speech channel is directed to an unknown voice, which tells Vasu that he has kidnapped his son Ravi (Aarav Ravi), who will die unless Vasu gives the missile to him, and Vasu agrees. While in flight, Vasu goes unconscious, and Swathi and Venkat take him to the sick bay. There, Vasu wakes up and goes into the wire chamber to cut the wire that controls the liquid hydrogen fuel tank. Vasu actually faked going unconscious due to directions from the unknown voice. Vasu cuts the wire, and the fuel tank loses much of its fuel.

One day Rony meets an unexpected guest Chandy and they become very close, however, Chandy does not disclose his true identity. Over time Chandy discloses his identity and introduces his daughter Santa and a lot of unexpected events follow.

The Tiger Security Team of the Storm Security Company is responsible for security and rescue work. Luo Xinglie is punished for accidentally injuring a hostage during a rescue mission. He gets reduced to a security officer and gets no reward for the mission. At this time, the Tiger Team receives a new mission, hired by the International Peace Foundation, to escort a truck full of water purifiers and a large number of crop seeds to the villages of Sakiya for civilian assistance. However, due to the invasion of the non-government organization in Sakya, some areas are in war. The team is likely to encounter fighting, and the unknown danger is gradually approaching.