The makers of O.M: Chapter 1 – Udhiram: The Blood Wood have unveiled the much-awaited trailer of the upcoming action thriller, bringing together three prominent actors—Dhanush, Mammootty and Sai Pallavi—in an intense story about the illegal red sandalwood trade. Released on November 13, the nearly three-minute trailer offers a closer look at the film's characters, its undercover police operation and the criminal network operating in the forests of Andhra Pradesh.
Directed by Rajkumar Periasamy, the film explores the dangerous world of red sandalwood smuggling and the efforts of law enforcement agencies to dismantle the syndicate. The trailer has generated curiosity among movie lovers, particularly because of Dhanush's transformation into an undercover operative and Mammootty's mysterious character.
The film is scheduled to arrive in theatres worldwide on November 20, 2026.
Dhanush Goes Undercover Inside the Red Sandalwood Mafia
Dhanush plays an officer associated with Tamil Nadu's Organised Crime Intelligence Unit. His character is assigned a dangerous undercover mission to infiltrate a red sandalwood smuggling network operating in the Seshachalam forest region.
Disguised as a woodcutter, he enters the criminal syndicate, works alongside its members and gradually attempts to gain their confidence. The trailer shows him moving through the forests, cutting wood and becoming part of the smuggling operation to identify the people controlling the illegal business.
However, the mission appears more complicated than a straightforward undercover assignment. Some sequences show Dhanush seemingly fighting against police personnel, creating uncertainty about how deeply he has become involved in the criminal network.
His character's double-sided position is one of the major attractions of the trailer. The makers have kept several story details under wraps, leaving audiences curious about the real extent of his mission.
Sai Pallavi Plays IPS Officer Nithya Reddy
Sai Pallavi appears in a powerful police role as IPS officer Nithya Reddy, who leads Andhra Pradesh's Exclusive Special Task Force.
Her character is responsible for coordinating Operation Mole, an operation aimed at bringing down the red sandalwood smuggling syndicate. The trailer presents her as a determined officer overseeing the investigation and working towards dismantling the criminal network.
Sai Pallavi's appearance adds another important dimension to the story, which revolves around a joint operation involving police forces from Andhra Pradesh and Tamil Nadu.
Her role is particularly interesting because the film places her character at the centre of the operation while Dhanush works undercover inside the syndicate.
Mammootty's Mysterious Character Becomes a Major Highlight
Mammootty's character is among the biggest talking points in the trailer. He plays a mysterious figure named Siya, who appears to have considerable influence over the illegal red sandalwood trade.
The visuals suggest that Siya may be the powerful mastermind operating behind the scenes, controlling the network through political and criminal connections.
Unlike a conventional villain introduction, the trailer offers only selected glimpses of his character, building an atmosphere of mystery around his intentions.
Mammootty's grey-shaded role is expected to create a strong conflict with Dhanush's undercover officer and Sai Pallavi's police operation. His presence adds considerable weight to the film's ensemble cast.
What Is the Story of O.M: Chapter 1 – Udhiram?
The film is set around the Seshachalam forest region of Andhra Pradesh, where the illegal trade in red sandalwood forms the foundation of the story.
Red sandalwood, also known as red sanders, is a rare and valuable wood found primarily in the Seshachalam hills. Its international demand, particularly in markets such as China and Japan, has contributed to illegal smuggling networks.
The film explores the criminal operations associated with this trade and the dangerous circumstances faced by people involved in transporting the wood.
The story follows a joint effort by the Andhra Pradesh and Tamil Nadu police forces to dismantle the syndicate. While Dhanush enters the network undercover, Sai Pallavi leads the wider police operation and Mammootty's character appears connected to the powerful forces behind the trade.
The subject gives the film a crime-thriller setting rooted in a real-world issue rather than a conventional fictional gangster story.
Director Rajkumar Periasamy's Film Draws Inspiration from a Real Incident
Written and directed by Rajkumar Periasamy, O.M marks his next major project after Amaran, which received widespread recognition.
The filmmaker has previously spoken about an incident from 2014 that partly inspired the emotional foundation of the screenplay. In an earlier conversation, he recalled watching a short video featuring a two-and-a-half-year-old girl at a ceremony. The image stayed with him for years and eventually became an important source of inspiration for the story.
Although the film is centred on red sandalwood smuggling and a police operation, the director's comments suggest that it also explores a deeper emotional dimension.
The cast includes Dhanush, Mammootty, Sai Pallavi and Sreeleela. Dhanush is also among the film's producers, alongside Shraddha Agrawal and Azmat Jagmag, under the banners of Wunderbar Films and RTake Studios.
Why Was the Film's Release Date Changed?
O.M was initially scheduled to release in theatres on October 16, 2026. However, the makers later postponed its release.
Dhanush explained that the decision was taken out of respect for superstar Rajinikanth, whose film Jailer 2 was scheduled to arrive on October 15. Since the two films were expected to release just a day apart, Dhanush announced that his film would move to a later date.
The makers also avoided the Diwali release window to prevent a clash with Suriya's film Scene.
The revised release date is November 20, 2026.
O.M to Release in Five Languages
The film is scheduled for a worldwide theatrical release on November 20 in Tamil, with dubbed versions planned in Telugu, Hindi, Malayalam and Kannada.
With Dhanush leading the story, Sai Pallavi playing a senior police officer and Mammootty portraying a mysterious figure connected to the smuggling network, the film brings together a notable combination of performers from Indian cinema.
The trailer has introduced the central conflict, but audiences will have to wait for the theatrical release to discover how the undercover operation unfolds and what role Siya ultimately plays in the red sandalwood network.
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