The film stars Suriya in dual roles, alongside Nayanthara, Pranitha Subhash, Premgi, Parthiban, and Samuthirakani.

The film was later remade in Bengali as Naqaab (2018), starring Shakib Khan, Nusrat Jahan and Sayantika Banerjee.

[8] A released prisoner named Kamal Ekambaram murders former Police Commissioner Shanmuga Sundaram during a morning jog.

On the other hand, Masilamani alias Masss and his friend Jet Li (Jettu) are small-time con artists.

He sabotages their plan and tricks Masss into running over Anthony while Kamal arrives and steals the money from the locker in the resulting chaos.

Corrupt ACP Vikram Lakshman takes charge, investigates the case, and learns Masss is involved in the murder.

Shakthi and Anu, along with Megha and infant Masss, arrived in India to complete the registration but learned that industrialists R. K. and Anthony forged documents and planned to take the land away to construct flats.

In the post-credits scene, Masss, now a reformed man in a respectable position, has married Manini and has a young son, Shakthi (named after his grandfather), who has the ability to see and converse with ghosts, while Jettu remains on Earth with Masss and his family, accompanying Shakthi at all times.

In early December 2013, Sify reported that Venkat Prabhu's next film after Biriyani (2013) would feature Suriya as the male lead and would also be produced by the actor himself under his newly launched company 2D Entertainment.

[20] On 25 May 2015, the film was renamed with a Tamil title Massu Engira Masilamani, to be exempted from the State Government's thirty percentage entertainment tax.

[25] Nayanthara was signed to play one of the female leads along with Amy Jackson,[26] while the director's brother Premji was given a significant supporting role as in all of Prabhu's films.

[30] In August 2014, the Times of India reported that Jayaram, who had worked with Venkat Prabhu in Saroja (2008), had been added to the cast and would be playing a prominent role, however, he was replaced by Parthiban.

[31] Actors Sriman,[32] Karunas and Daniel Annie Pope of Idharkuthane Aasaipattai Balakumara (2013) fame were reported to be playing the roles of spirits in the film.

[36] In November 2014, Amy Jackson opted out of the project,[37] explaining that the makers had changed her character and the script, which would have resulted in her shooting only for half the number of days than she was initially committed to.

[39] In October 2014, Riyaz Khan was named to be a part of the film, and was said to be playing "a very important role with a unique characterization".

[40] Prinz stated that he played one of the villains in Masss and that he would appear for a short duration but share screen space with Suriya.

[49] By early December, the team shot crucial portions including a duet song sequence involving Suriya and Pranitha in Bulgaria.

The film's soundtrack album features seven tracks composed by Yuvan Shankar Raja, with two instrumentals and a remix done by Premgi Amaren.

[2] Sopnam Films bought the Kerala distribution rights for Masss as well as two other Studio Green productions, Komban and Darling.

[69] Upon release, Behindwoods gave the film 3.5 stars out of 5 and said, "It has the expected Venkat Prabhu elements, the crowd-pleasing supernatural factors treated in a slightly different way and of course, Suriya in all his glory.

"[71] Oneindia rated it 3 stars as well and wrote, "Thanks to Suriya's brilliant performance and Venkat Prabhu's intriguing story telling ability, Masss will surely be enjoyed by the masses albeit poor VFX hindering the quality of the movie.

"[72] Indiaglitz gave 3 stars out of 5 too and stated, "Venkat Prabhu has been stereotyped as the director who loves party hard movies, a bit of adult humor and all that, but in Masss he has steered clear of those elements and has given a wholesome family entertainer with an interesting storyline.

"[78] Writing for The Hindu, Baradwaj Rangan stated, "The idea behind the supernaturally themed Massu is terrific, even it feels like a mashup of many spirit-driven films...the thing with Venkat Prabhu's films these days...(is)...they're all ideas and no follow-through...It's only in the last hour or so that Massu begins to score.

"[79] Malini Mannath from The New Indian Express wrote, "Not very funny, not very scary, and not very original, Venkat Prabhu's attempt at crafting his first supernatural-comic-vendetta flick, turns out to be a disappointing and a boring affair...The director weaves in a hotchpotch of situations, the screenplay is sloppy and narration is jerky.