UUNCHAI is the story of a life-changing journey of three friends. Amit Shrivastava (Amitabh Bachchan) is a successful author, based in Delhi. He is separated from his wife Abhilasha (Nafisa Ali Sodhi) and the closest people in his life are his three friends – Javed (Boman Irani), Om Sharma (Anupam... Kher), and Bhupen (Danny Denzongpa). The quartet meets on Bhupen’s birthday and makes merry. Bhupen, who’s originally from Nepal, expresses the desire to head to Everest Base Camp along with Amit, Javed, and Om. The friends, however, reject the idea, citing their old age and health issues. Bhupen goes home after the party and passes away in his sleep. Even in the case of Bhupen, his friends are his only family and they handle the cremation and other rituals. While going through Bhupen’s study, Amit finds that the former has booked a tour package to the Everest Base Camp for his three friends. The tour is going to take place in two months. Meanwhile, Om is making plans to immerse Bhupen’s ashes in the river Ganga in Varanasi. Amit informs Om and Javed about Bhupen’s Everest plan. He persuades them to join him so that they can release his ashes at the Base Camp since it was Bhupen’s favourite place on Earth. Om and Javed agree after a lot of persuasion. But there’s a problem. Javed’s wife Shabana (Neena Gupta) will never allow her hubby to take such a risky trek. Hence, Amit comes up with a plan. He tells Shabana that the trio will go to Kathmandu, Nepal where they’ll immerse his ashes. As per the plan, they’ll go to Kathmandu by road since Om is scared of flights. Amit tells Shabana to join them. He tells her that they’ll drop her at Kanpur at her daughter Heeba (Sheen Dass) and son-in-law Valli (Abhishek Pathania)’s place. Once that’s done, the trio will then head to Gorakhpur where Om will meet his brothers, whom he hasn’t met in 30 years. The three friends and Shabana begin their trip. But sadly, Amit’s foolproof plan goes for a toss. What happens next forms the rest of the film.