The journey of a military officer who has been assigned to fight aliens.

A gang has kidnapped a girl and several police officers, including Karthik (Sibiraj), who is attempting to rescue her. During a shootout, one man from the gang and a police officer Arul (Raghav Umasrinivasan), who is a good friend of Karthik, are killed, while Karthik gets injured. He is put out of action and suffers from posttraumatic stress disorder.
Subramani (Idoh) is a trained military dog who has the potential to nab culprits and to decipher a crime scene. After its owner, an army officer, is shot dead, Subramani is returned to the officer’s father in Coimbatore, who is a neighbor of Karthik. The neighbor leaves the town and requests Karthik to provide shelter to Subramani during his absence. Karthik denies the request but provides shelter after seeing Subramani being troubled the small kids in the neighborhood. Karthik learns about Subramani and becomes good friends with it.

Will a talking teddy prove to be Man’s best friend? Witness a bizarre exchange between a loner and a toy bear as they solve medical mysteries against all odds.

Despite qualifying for armed force, Karthik (‘Jayam ‘ Ravi) prefers to be a traffic cop in Ooty as he believes that such a no risky job would help him get enough time to look after his cute little sister Vidhya (Baby Anikha). Karthik also has a short lived one side love story with Renu (Lakshmi Menon), who is a doctor. When a hazardous chemical in the nearby industry gets leaked, a dog consumes it and turns into a zombie. As the dog bites a watchman, he too becomes a zombie and eventually, the virus spreads rapidly across the town. Can Karthik save his sister and the city ?

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.