In one of their many missions, Eesa, along with his army friends, Rafiq and Sembatta alias Stephen, are forced by their General, Buller, to shoot innocent and defenceless freedom fighters at a public gathering.

When the soldiers are disposing the bodies of the freedom fighters, Stephen commits suicide out of guilt, prompting Eesa to kill Buller.

The gemstone is instilled back in the temple and the British empire issues a heavy bounty on Eesa, Rafiq, Sengolan and the other revolutionaries.

In the epilogue, Rajadhipathi's daughter, Princess Shakunthala, learns about Velmathi's involvement in her father and brother's death from a sly Kanagasabai.

[13][14] In an interview to the media in late April, Arun revealed that the film was not about the real life LTTE rebel Captain Miller.

He further revealed that it is an action adventure film which would be mounted on a massive budget to cater to a larger audience and would not have any item songs.

[26] Daniel Balaji, Elango Kumaravel, Viji Chandrasekhar, Swayam Siddha and "Merku Thodarchi Malai" Antony were also cast that month.

[27] In October 2022, Arun met Kannada actor Shiva Rajkumar in Bangalore and narrated the entire story of the film in 40 minutes.

[36] In June 2023, Daniel Balaji left the project due to scheduling conflicts, caused by continuous delays to the start of filming his scenes.

[50][51] A couple of days later, the director refuted claims that the team was shooting in Kalakkad Mundanthurai Tiger Reserve (KTMR) and stated that the film was being shot on private land and necessary permissions had been procured.

[52][53] Following the event of blasting explosives, the residents of Tenkasi filed a petition against the film production team for breaching regulations within the buffer zone of KMTR.

As a result of persistent complaints from the local community that day, Tenkasi Collector Durai Ravichandran ordered a halt to the filming.

[60][61] Captain Miller is G. V. Prakash Kumar's seventh collaboration with Dhanush after Polladhavan (2007), Aadukalam (2011), Mayakkam Enna (2011), Asuran (2019), Maaran (2022) and Vaathi (2023) and his first with Matheswaran.

[72] The third single "Koranaaru" is a dance number picturized between Dhanush and Shiva Rajkumar, and is accompanied with udukai, thavil and bass instruments.

"[79] Gopinath Rajendran of The Hindu said that Prakash "retains his fantastic streak with Dhanush" with his music and the visuals (by Siddhartha Nuni) adding "great value for the film".

"[81] M. Suganth of The Times of India praised Prakash, "who manages to bring in emotions lacking in the film with his fabulous background score [...] he has perfectly blended rural percussion with fusion that soothes as well as pump up the audience.

[83] In late March 2023, Marumalarchi Dravida Munnetra Kazhagam Keezhapavur union councillor Rama Udayasuriyan accused the film's production unit of causing damage to the Chenkulam canal bank and constructing a wooden bridge over the waterbody without proper authorisation.

[84][85] Sources revealed that the crew had been camping in the KMTR buffer zone since the end of January and constructed a big set, for major shooting, on private land.

When contacted, the Wildlife Warden of KMTR, S. Senbagapriya, stated that she was not informed about filming in the buffer zone and that the forest department had not granted permission for shooting in Mathalamparai.

[84] Post release, Vela Ramamoorthy accused the makers of plagiarising his novel Pattathu Yaanai, and decided to approach the Tamil Nadu Film Director's Association seeking "justice".

[91] The film began streaming on Amazon Prime Video from 9 February 2024 in Tamil and dubbed versions of Telugu, Malayalam and Kannada languages.

[94] Sajesh Mohan of Onmanorama wrote, "Arun Matheswaran's Dhanush starrer 'Captain Miller' is a period drama that discusses present-day issues, and a must-watch in theaters.

With a socio-political undertone, just like his previous films, caste discrimination is what rakes up the story and ultimately conveys a message that is relevant even today, despite being set in the pre-Independence era.

"[97] Kirubhakar Purushottaman of The Indian Express gave 4/5 rating and wrote, "There's not even a single moment in the entire 160 minutes of runtime where Arun Matheshwaran's script meanders.

[99] Latha Srinivasan of Hindustan Times also praised the performances and music, stating, "The bottomline is that Captain Miller is a highly-engaging – but different – must-watch film this Sankranti.

"[101] Sudhir Srinivasan of The New Indian Express gave 3/5 rating and wrote, "It's fascinating to observe how Arun Matheswaran has the film stepping forwards and backwards and slowly but steadily, constructs his story.

"[102] Divya Nair of Rediff gave 3/5 rating and wrote, "The heart of Captain Miller is in the intelligent dialogue exchanges where the characters talk about equal rights, dignity of life, and the true meaning of freedom.

"[103] S. Devasankar of Pinkvilla gave 4/5 stars and wrote, "Captain Miller is one such example where the story that is written on paper is brought to life and transports the audience to the world in which it is happening.

"[104] Manoj Kumar of OTTplay gave 3 5/5 stars and stated, "Captain Miller may be set in the period of the British Raj, but the themes, concepts and issues that it deals with feel timely and relevant.

"[105] Krishna Selvaseelan of Tamil Guardian was less glowing in his review, awarding the film 2.5 out of 5 stars, stating, " Underwritten, focussing on 'mass' moments rather than being tonally/emotionally/logically cohesive and with a weak script, Matheswaran's shift to commercial cinema is sadly not a successful one.