Cast

Credited cast:
	Rajinikanth	...	Kaali
	Vijay Sethupathi	...	Jithu
	Siddique	...
	Simran	...	Mangalam
	Trisha Krishnan	...	Saraswathy
	M. Sasikumar	...	Maalik
	Bobby Simha	...	Michael
	Megha Akash	...	Anu
	Malavika Mohanan	...	Poongodi
	Mahendran	...	Rajapandi
	Aadukalam Naren	...	Gnanam
	Y. G. Mahendra	...
	Ramdoss	...
	Chinni Jayanth	...
	Ravichandran	...
	Vaibhav Reddy	...

Storyline

Kaali, a mysterious and deceivingly elderly man, takes up the job of a boys' hostel warden at a college in Ooty. He notices that the hostel is dominated by a group of unruly final-year students, who are led by Michael, the spoiled son of a local leader named Gnanam. Kaali puts a stop to Michael's antics, which leads to enmity between the two. Kaali also forms a close bond with a NRI hostelite named Anwar, who is in a relationship with Anu, the daughter of Mangalam, a pranic healer. Kaali convinces Mangalam to accept her daughter's relationship with Anwar, and they end up falling in love.

Michael, who lusts for Anu, is angered on hearing of her relationship with Anwar. He attempts to harass them, only to be stopped by Kaali, who ensures the suspension of Michael and his friends, with Anwar recording and sharing the humiliation of Michael and his gang. This video is noticed far away in Uttar Pradesh by a local goon named Jithu, the son of a powerful politician called Singaaram alias Singaar Singh. Singaar, on seeing Anwar in the video as well as in a photo with his mother on Facebook, sends his men to Ooty to kill Anwar, for unknown reasons. At the same time, Michael, humiliated at his suspension, sends his men to beat up (but not kill) Kaali. Michael's plan backfires as he and his men are caught in the fight between Kaali and Singaar's men. Kaali subdues Singaar's men, earning Michael's and Gnanam's respect, following which Anwar learns about his past.

Anwar is the son of Maalik, who was Kaali's best friend. It is also revealed that Kaali's real name is Petta Velan alias Petta and that he was a well-respected man in his village in Madurai district. Twenty years ago, Maalik is shown to be with a friend talking about the works of Devaram and Singaar, who were digging the sand so they could get money. Devaram gets arrested but Maalik was in love with Petta's neighbour Poongodi, who conceived with him out of wedlock. 

Petta first disagreed, stating that it will be a shame of being family with them as they killed Abdul Ayya "Maalik's father". Petta finally agrees, he and his wife Saraswathy alias Saro managed to convince Poongodi's father Rajapandi to get Poongodi married to Maalik, even though Rajapandi and Petta were sworn enemies. But Rajapandi's two sons, Devaaram and Singaar, vehemently opposed the alliance as well as the transfer of property to Poongodi. They then killed their father. 

Petta, on hearing about Rajapandi's murder, killed Devaaram during Rajapandi's funeral and chased Singaar out of the village. As revenge for Devaaram's killing and his forced exile, Singaar orchestrates a bomb blast during Poongodi's seemantham, killing Maalik, Saro, and Petta's son Chinna. Petta, after finding that Poongodi was still alive, took her to safety. 

Poongodi later gave birth to a boy, who is revealed to be Anwar, and both of them left for Australia as refugees to escape from Singaar. On hearing this story, Petta and Anwar, along with Michael's henchmen, leave for Uttar Pradesh to finish off Singaar once and for all.

In Uttar Pradesh, Petta and Anwar confront Jithu, who is determined to kill them both after learning that his father and Petta are enemies. The duo manages to escape Jithu. Later, Petta meets Jithu privately and tells him that he is none other than his son Chinna, who did not die in the bomb blast but was adopted by Singaar after finding him still alive in the wreckage of the blast. When Jithu confronts Singaar regarding his parentage, the latter sends his men to kill Jithu, who is rescued by Petta. Along with Anwar and Michael's henchmen, Petta and Jithu then barge into Singaar's mansion and kill him and his henchmen.

Following Singaar's death, Petta has a surprise in store for Jithu. He reveals that Jithu is not his son and that he really is Singaar's son. He used him to lead him to Singaar as part of a strategy to kill the latter. He further adds that Chinna had died in the bomb blast twenty years ago. After this shocking revelation, Petta points his gun at Jithu. The screen cuts to black, with a gunshot heard.   

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