Development In January 2014,
Vijay expressed his interest to work with a project directed by
Atlee, after being impressed by his debut directorial film
Raja Rani (2013); the latter also expected to work in the film, since he had been a fan of the actor, and also admired his recent projects. The producers further announced that the team would start filming only after the completion of Vijay's other film
Puli (2015), while Atlee continued to script the film through late-2014. In November 2014,
G. V. Prakash Kumar was announced as the music composer collaborating with Vijay and Atlee again, after
Thalaivaa and
Raja Rani. Several of the technical crew involved in Atlee's previous film,
Raja Rani, were also added to the team including cinematographer
George C. Williams, editor
Ruben and art director
T. Muthuraj. The film is touted to be an emotional-action thriller where Vijay would essay the role of a police officer and a father in the film, and was reported to be inspired from
Chatriyan (1990). Several titles for the film including
Moondru Mugam,
Vetri,
Thuppaki 2,
Khakee and
Thaarumaaru were considered, before the makers finalised
Theri in late November 2015. The first look of the film was also released on that date.
Casting Nayanthara, in January 2015, the actress refuted claims of being part in the film. Later,
Samantha Ruth Prabhu was announced as the female lead. Amy Jackson was reportedly essayed the role of a Malayalam-speaking school teacher in the film. Initially, the team approached few Hindi actresses for Jackson's role, whom had turned down the offer. In March 2015, veteran actress and film producer
Radhika Sarathkumar was essayed the role of Vijay's mother in the film, collaborating with Vijay for the second time after 27 years.
Bharathiraja refused on being a part of the film and led Atlee choose veteran director
Mahendran as the antagonist.
Prabhu also to play a role.
Sunaina was also roped in to play an extended cameo in the film. Actress
Amritha Aiyer, appeared in an uncredited role playing Samantha's friend.
Filming An official launch event was held at the Kerala Club House on the
East Coast Road in
Chennai, with several members of the cast and crew in attendance on 26 June 2015. The film began production in Chennai during early-July 2015 and an introductory song for Vijay was shot in the city, followed by scenes featuring Vijay and Samantha on the East Coast Road. Further scenes in Chennai were shot at Adityaram Studios and at
Binny Mills, where art director T. Muthuraj had erected a huge set. Radhika was also a part of the shoot, while actress
Sunaina shot for one day in the schedule which ended in mid-July. The second schedule was reported to begin during the end of the month, was briefly delayed owing to a strike held by the
Tamil Film Producers Council against
Film Employees Federation of South India. The second schedule for the film restarted in Chennai on 3 August 2015, with Vijay and Samantha joining the shoot and went for 25 days. Few sequences were also shot at
MGM Dizzee World on the East Coast Road. In mid-September, the team shot few sequences at veteran actor
Sivaji Ganesan's ancestral house Annai Illam and the shoot went for 2–3 days. In November 2015, it was revealed that the film was "seventy percent complete" and portions involving Samantha Prabhu had finished being shot. Thereafter, Amy Jackson subsequently joined the team in Chennai to shoot for her part during a new schedule. Action scenes, choreographed by
Dhilip Subbarayan were filmed throughout the month, with the shoot disrupted by the
heavy flooding in Chennai. Hollywood stunt choreographer Kaloyan Vodenicharov worked with the team in early December 2015 to help shoot the climax portions for the film. Poor climatic conditions in China meant that the team had to abandon their idea of filming sequences there and instead opted to shoot in
Bangkok. Sets were erected in a factory in Chennai to shoot the climax scenes, with Kaloyan recruited to help train artistes and film the sequences during December 2015. In mid-January 2016, an under water stunt sequence was filmed under the guidance of Subbrarayan. The team started filming a song featuring Vijay and Jackson, and with the completion of the song, the principal photography was wrapped. == Music ==