Story Structure — 5 Plot Phases
The First Infection
A toxic spill leads a dog to attack a security guard, beginning a chain of zombie infections. Karthik's life in Ooty is introduced alongside his care for Vidya and his unspoken love for Renuka.
Key Events
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Toxic Liquid Spills — Toxic liquid spills from a transport vehicle near the laboratory.
Location: Chemical laboratory, Ooty
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Dog Starts Infection — A stray dog consumes the liquid, turns violent, and bites a security guard.
Location: Chemical laboratory, Ooty
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Guard Turns Zombie — The bitten guard becomes a zombie within hours and spreads infection through bites.
Location: Ooty
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Karthik Protects Vidya — Karthik lives with and cares for his younger sister, Vidya. Characters: Karthik, Vidya
Location: Ooty
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Karthik Loves Renuka — Karthik loves Renuka but does not propose during their meetings. Characters: Karthik, Renuka
Location: Ooty
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Traffic Incident with Minister — Karthik allows an auto carrying pregnant women into the Minister's way. Characters: Karthik, Minister Gurumoorthy
Location: Ooty
A Sister Lost in Ooty
After his confrontation with Minister Gurumoorthy, Karthik discovers Vidya is missing as the zombie outbreak reaches Ooty. While searching for her, he encounters Renuka and the doctors working on a cure.
Key Events
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Vidya Goes Missing — Karthik discovers Vidya is missing and begins searching for her. Characters: Karthik, Vidya
Location: Ooty
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Outbreak Order Issued — Police are ordered to shoot anyone who has turned into a zombie.
Location: Ooty
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Search Through Infected Ooty — Karthik posts notices for Vidya and kills zombies in his path. Characters: Karthik
Location: Ooty
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Doctors Seek a Cure — Karthik finds Renuka and doctors working to find a cure for the undead. Characters: Karthik, Renuka, Dharan
Location: Doctors' location in Ooty
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Vidya Found at Pool — Karthik finds Vidya surrounded by Gurumoorthy's zombified henchman and learns zombies fear water. Characters: Karthik, Vidya, Minister Gurumoorthy
Location: Swimming pool at Renuka's house
Flight Toward Coimbatore
Karthik and the survivors leave for Coimbatore, where they hope to use medical equipment to find a cure. They discover the infection has spread there, and Dharan secretly carries a zombie scratch.
Key Events
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Escape from Renuka's House — Karthik is asked to save doctors trapped inside as zombies invade the house. Characters: Karthik, Renuka
Location: Renuka's house
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Journey Toward Coimbatore — Karthik escorts the doctors, Gurumoorthy, and Vidya toward medical equipment in Coimbatore. Characters: Karthik, Dharan, Renuka, Vidya, Minister Gurumoorthy
Location: Road toward Coimbatore
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Dharan Hides His Scratch — Dharan hides a zombie scratch because its infection has a delayed onset. Characters: Dharan
Location: Near Mettupalayam
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Coimbatore Is Infected — The group discovers the infection has spread to Coimbatore and drives through surrounding zombies. Characters: Karthik, Dharan, Renuka, Vidya, Minister Gurumoorthy
Location: Near Mettupalayam
The Mall and the Immune Girl
The group shelters in a mall opposite the hospital while zombies surround them. Dharan transforms and bites Vidya, but her failure to turn reveals immunity that may help produce a vaccine.
Key Events
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Survivors Take Mall Shelter — The survivors take shelter in a mall as a horde gathers; they encounter its frightened security guard. Characters: Karthik, Renuka, Vidya, Minister Gurumoorthy, Mall Security
Location: Mall opposite the hospital
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Dharan Bites Vidya — Dharan transforms and bites Vidya; Karthik kills him, but Vidya does not transform. Characters: Dharan, Vidya, Karthik
Location: Mall
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Vidya's Immunity Revealed — Kamal says Vidya's antibodies and immunity could help them find a vaccine. Characters: Vidya, Karthik, Renuka
Location: Mall
Karthik's Final Escort
Karthik uses pressurized water to guide survivors toward the hospital, then returns for Renuka without that protection. Bitten while saving her, he turns and asks her to shoot him; the doctors find an antidote, and Karthik is later seen alive as a zombie on a bus to Chennai.
Key Events
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Water-Assisted Hospital Crossing — Karthik uses pressurized water to escort the group across to the hospital, but Renuka is left behind. Characters: Karthik, Vidya, Renuka, Minister Gurumoorthy, Mall Security
Location: Route from mall to hospital
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Karthik Saves Renuka — Karthik returns without water, gets bitten while escorting Renuka, and tells her to shoot him as he turns. Characters: Karthik, Renuka
Location: Route from mall to hospital
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Renuka Shoots Karthik — Renuka realizes Karthik loves her but shoots him after he becomes a zombie. Characters: Karthik, Renuka
Location: Hospital
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Antidote Is Found — The doctors find the required antidote and begin dealing with the virus. Characters: Renuka, Naveen, Vidya
Location: Hospital
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Karthik Survives the Shooting — Karthik, now completely a zombie, is seen atop a bus bound for Chennai. Characters: Karthik
Location: Bus traveling to Chennai