Plot
Paandi and Poochi, lifelong friends and petty thieves, are raised by Pasupathy, a former drug peddler and thief turned businessman who now owns a pizza restaurant. Psycho Salim, a retired goon, is planning a fake robbery worth ₹2 crore at his house to claim the insurance money. He enlists Pasupathy's help, asking him to keep the jewels safe and promising to return Pasupathy's cash and jewels once the insurance money is received. Pasupathy tasks Paandi and Poochi with carrying out the fake robbery at Psycho Salim's house. However, the duo gets the door number wrong and ends up at Door No. 56 instead of 65, where they brutally beat up the occupant, Inspector Aabathu, a police officer. After being reprimanded by Pasupathy, Paandi and Poochi proceed to Psycho Salim's house and complete the robbery. During their celebratory drinking spree, they transfer the looted money to a new backpack, and Paandi buys an identical bag and hands it over to a rag picker. Unbeknownst to them, a rag picker mistakes Paandi's bag for his own and takes it, leaving Paandi and Poochi with a bag full of trash.
Meanwhile, Paandi harbors unrequited love for Jennifer "Jenny," Pasupathy's France-returned daughter and their childhood friend. The police investigation into the theft at Psycho Salim's house is led by none other than Inspector Aabathu, who was beaten by Paandi and Poochi earlier. Nettai, who was saved by Paandi and Poochi in a bar fight, reaches out to them for help in retrieving the lost money. They, in turn, contact four former gangsters: Memory Dass, who suffers from memory loss; Dhamuthara "Damar" Lal, a deaf gangster; Kudi Kumar, a drunkard; and Split Soosai, a gangster with split memory who thinks he's also a policeman. These four eccentric gangsters agree to help Paandi and Poochi. Initially, Paandi and Poochi plan to loot a jewelry shop with these four aged gangsters. However, their disabilities and carelessness foil the plan, leading Paandi and Poochi to abandon the idea in frustration.
Later, Paandi returns to the aged gangsters as they reveal their plan to loot the World Oriental Wealth (WOW) Bank. The gangsters had previously attempted to rob the bank with the help of the bank's manager, Dharman, who provided them with the floor plan. However, Dharman betrayed them, and they were arrested. During their prison term, they developed various disabilities due to fear and torture. Feeling sympathetic towards the aged gangsters, Paandi decides to cooperate with them to loot the bank and exact revenge on Dharman. To execute their plan, they set up a fake pizza shop near the bank, using Jenny as a front. From this shop, they begin digging a 1.5km long subway leading to the bank's locker, which is already 50% complete.
Minister Sengundran's private videos have been leaked, and the person holding the videos is threatening him. Sengundran seeks Inspector Aabathu's help to delete the video and eliminate the threat. Before Aabathu can capture the person, he dies from a dog attack. Aabathu learns that the private videos are on a pen drive hidden in the WOW Bank locker. Aabathu plans to set up a fake robbery attempt at the bank, allowing him to take charge and retrieve the pen drive. Meanwhile, Pasupathy learns that Paandi and Poochi have lost Psycho Salim's ₹2 crore money and, fearing Salim's wrath, joins them to dig a subway to the bank. As they dig intensely, they finally reach below WOW Bank. Before entering the bank, Split Soosai suggests kidnapping Dharman's daughter, Priya. Paandi and his team kidnap Priya, who is planning to elope with her boyfriend. However, Paandi decides to reunite Priya with her lover, and Jenny confesses her feelings for Paandi after witnessing his good deed. Memory Dass forgets about the kidnapping plan and starts cooking at Dharman's house. Later, he remembers and kidnaps Priya again, leading to a ransom demand of ₹1 crore from Dharman.
The rag picker opens the bag and finds it filled with money and jewels, and places them in his locker at WOW Bank. Meanwhile, Paandi and his team sneak into the locker room, and Aabathu's fake theft team also enters the bank. With the expertise of the 4 aged gangsters, they open the locker, and Paandi retrieves his lost bag containing ₹2 crore, which the rag picker had just placed there a few minutes ago. They further loot the locker, and Sengundran's pen drive is mistakenly taken by Paandi during the loot. Before Aabathu arrives to take control of the bank locker, Paandi and his team escape with the money via the subway, but Split Soosai gets caught and his split personality behavior emerges, causing him to behave like a police officer. Meanwhile, Paandi loses Sengundran's pen drive, which is picked up by a group of transgender people on the road. They hand it over to Sengundran's PA, who mistakenly plays the minister's private video in front of a public gathering, making it go viral.
Psycho Salim apprehends Pasupathy and his family for losing his money. Paandi and Poochi arrive just in time with the money, freeing them from Psycho Salim's clutches. Aabathu and the police team arrive to retrieve the pen drive, unaware that Sengundran's video has already gone viral. During the fight, Jenny proposes her love to Paandi. A shootout and a fight ensue between Paandi's team and the police. Just as they realize the chaos, a news report states that the Indian currency notes have been completely devalued, rendering their entire looted money worthless. Paandi's team then remembers the ransom jewels given by Dharman, which are kept near a highway stone. However, before they can retrieve them, the same rag picker takes the bag containing the jewels.
