Singham is a 2011 Indian Hindi-language action film directed by Rohit Shetty and produced by Reliance Entertainment, based on a script by writers Yunus Sajawal and Farhad-Sajid. A remake of the 2010 Tamil film Singam by Hari Gopalakrishnan, the film stars Ajay Devgn as a station house officer turned police inspector Bajirao Singham, with Kajal Aggarwal playing his love interest and Prakash Raj playing the main antagonist. The theatrical trailer was attached with Salman Khan‘s Ready in June 2011. It was theatrically released in India on 22 July 2011 with a strong box office response;[3] the film earned ₹876 million in India on the first day and a worldwide total of ₹1.57 billion against a ₹410 million budget, becoming a box-office blockbuster.
Following the film’s success, Devgn and Shetty collaborated on three follow-ups to the film – the first of these, Singham Returns, which marked Shetty’s production debut and was produced by Devgn, reunited the duo with Kareena Kapoor Khan who replaced Aggarwal as the female lead, and was a direct continuation to Singham, set in Mumbai, with the basic plot inspired by the 1993 Malayalam film Ekalavyan; the second, Simmba, lifted from the 2015 Telugu film Temper and starring Ranveer Singh as the titular anti-heroic orphaned cop with roots in Shivgarh, alongside Sara Ali Khan and Sonu Sood, was the first spin-off and the first expansion to officially create a Cop Universe, with Karan Johar joining Shetty as a producer on the film; the third entry, Sooryavanshi, a second follow-up starring Akshay Kumar as the titular anti-terrorist squad chief, Singham’s friend, was slated to release in March 2020, but was postponed due to the 2020 coronavirus pandemic lockdown announced by the Indian government. All three films were co-produced and distributed by Reliance Entertainment.
Source : Wikipedia