[10][11] Originally shot in Malayalam, it was dubbed in Tamil, Telugu and Hindi and simultaneously released worldwide on 12 December 2019.

[12][13][14][1] During the medieval fair of Mamangam, twelve-year-old warrior Chandroth Chanthunni becomes a legend after putting up a brave fight against the Zamorin.

The story then shifts to 24 years later where 2 of the latest warriors in Chandroth Tharavaadu are preparing to leave to Mamangam festival or Mamangappattanam as Chaverukal after they had visions from Thirumanthankunnu Devi to do so.

As Zamorin's men are hunting down Chaverukal who are setting of to the festival, Panikkar and Chanthunni decides to leave secretly after completing all the customs they had to do in their Tharavaadu and saying a sorrowful goodbye to their relatives.

During the investigation Thalachennor receives different versions of stories on the death of Koya from Unnimaya, her lover Rarichan and her sister Unni Neeli.

Earlier during the fight, Thalachennor had advised the Zamorin to leave the seat and hide in the Nilavara fearing Valiya Panikkar's skills, which he agreed to.

After reaching the Nilapaduthara, Valiya Panikkar had only 2 choices, one was to die by the hands of the men simply and attain fame by his death or to escape the fest.

After this incident he understands that being a Chaver was useless and the death of all these men for these many years was a waste as the Zamorin who took the procession by force had died centuries before.

Thalachennor finds out that it was the work of Valiya Panikkar who had earlier promised Chanthunni that he would bring his body back to the village in case he died.

After seeing his body and hearing the advice of Valiya Panikkar, the villagers and the family members learn about their mistakes and decide that no more Chaverukal will be sent.

Mamangam was originally planned by director Sajeev Pillai who has written the script, which is based on Mamankam festival that was celebrated during the 17th century.

[18] Prachi Tehlan, Anu Sithara and Hindi film actress Pranchi Desai were hired for the female lead roles.

[19][20] Achuthan who is trained Kalaripayattu was cast as Chandroth Chanthunni Menon, a 15-year kid who is the youngest fighter in the history of Mamankam.

[21] Kaniha, Iniya, Siddique, Sudev Nair, Suresh Krishna and Manikkuttan were also hired for pivotal roles.

[40] The sets are created in an 18-acres of plot in Maradu where the old era is recreated and was erected by close to thousand labourers and cost around 5 crores.

[23] The war sequence of the film were shot in 20 acre land in Nettoor, which was built by around 2000 workers and costing 10 crore was constructed with 10 tonnes of steel and 2000 cubic metre of wood.

[51] Times of India gave 3 out of 5 stars and wrote that music and background score are good, "however, the drama does feel like a lost opportunity, considering the talent that was on offer, the stories they could have mined and fictional elements they could have inculcated,".

While it manages to achieve it to an extent, the film is not a wholesome experience" and "the stunt sequences are hard to believe" and the "VFX is tacky".

[53] Manorama Online rated 3.5 stars out of 5, called it "an epic tale of feud and bloodshed", and appreciated the cinematography but said the stunts could have been better choreographed.

[54] Sify gave 3 stars out of 5 and wrote that "Mamangam may not be trying to impress with too much heroism but is a genuine and emotional tale from the past that is engaging.

"[55] The Indian Express rated 2.5 stars out of 5 and wrote, "A movie that could have narrated an intriguing story of suicidal warriors from Malabar region during the 18th century has turned out to be a collage of old school Malayalam stunt scenes, and cringe-inducing situations and dialogues which make you feel like you are watching a Malayalam serial ... the movie fails to live up to viewers' expectations as it is let down by the amateurish approach to the screenplay and direction".

[56] Firstpost wrote "Thematic relevance, courage and sensitivity are not enough to hold up an entire film though when the writing is shallow and the storytelling style [is] dull.

These twin problem areas combined with action scenes and visual effects that are a mixed bag end up pulling down Mamangam".

[57] HuffPost wrote "The making is distinctly old school, with stagey production, wordy dialogues and tediously framed action scenes ...

Mammootty's character—Chandroth Valiya Panicker— is the most underwhelming period hero ever", also criticised the "bad writing", inorganic stunts and amateur VFX.

[58] Rating 1.5 out of 5, The News Minute called it a dull and "tedious underwhelming film", writing that "Mamangam gives the distinct feel of watching a mega serial.

The stunts don't look realistic at all, with the warriors flying in the air as if they were playing a quidditch match on invisible broomsticks" and "Mammootty has a faintly regretful expression on his face, as if he's realised that he's walked into yet another bad film".