Lion 3) is a 2017 Indian Tamil-language action thriller film[3] directed by Hari and jointly produced by Studio Green along with Aadnah Arts.

The film stars Suriya reprising his role as S. Duraisingam, alongside Anushka Shetty, Shruti Haasan, Thakur Anoop Singh, Robo Shankar, Soori, Krish, Radhika Sarathkumar, Sarath Babu and Vijayakumar.

Devi Sri Prasad who is supposed to compose the film's music was replaced by Harris Jayaraj, cinematography was handled by Priyan and editing by V. T. Vijayan.

[4][5] A debate occurs within an Andhra Pradesh state assembly about the long pending murder case of Visakhapatnam city commissioner Ramakrishna.

Singam had previously kept his marital status a secret to protect his wife, but after curiosity from constable Veeram, he lies and closes it as a divorce, revealing the truth only to Inspector Subba Rao.

A local schoolteacher informs Singam that a toxic smoke attack from the nearby dump killed his 32 students, including his grandchildren.

Singam realizes that Ramakrishna intended to expose illegal dumping of mediwaste and electronic waste, which included recycled tablets being sold to the public and the smoke attack on the school.

Later, Singam heads to Vizag harbour to obtain evidence from Reddy's containers, but is attacked by his men while Ravi murders the school teacher.

Singam narrowly escapes Vittal and returns to India, where he finds that Reddy has been bailed by three criminals, who framed the commissioner for supposed assault on one of their wives, and justify the murder as vengeance.

Singam is also fired from the CBI for speaking out of turn, but has the Home minister transfers him as an officer in Vizag to continue pursuing Reddy's men.

Singam decides to finish this once and for all and gets an arrest warrant for Vittal using computer evidence of agreements signed with medical companies, hacked by Murali.

While the first film was primarily shot within Tamil Nadu and the second featured a few scenes in South Africa, Hari stated that the third part would be more "international" and would be set in three countries as the protagonist tackles a global issue.

[13] New actors to the series including Radhika, Soori, Robo Shankar, Krish and Nithin Sathya were added to the cast, while Thakur Anoop Singh was signed on to portray the lead antagonist.

However, due to a request from the makers of Dhruva, the film release date was pushed even later on 23 December to make most of the Christmas holiday season, but was delayed after the team chose to allow the public of Tamil Nadu more time to recuperate from the aftermath of Cyclone Vardah and the demonetisation problems.

[33][34] Prior to the film's revised release date of 26 January, PETA India had remarked that Suriya was trying to garner publicity for Si3 by speaking out against the organisation at the 2017 pro-jallikattu protests.

[35] The film was pushed back even further following riots in Chennai at the end of the protests, with the producers finalising a worldwide theatrical release date of 9 February.

[37][38] Thinkal Menon of The Times of India gave 3/5 stars and wrote "Suriya, who carries the entire film on his shoulders, is in full form.