CBI 5: The Brain
CBI 5: The Brain is a 2022 Indian Malayalam-language mystery thriller film directed by K. Madhu and written by S. N. Swamy. The film stars Mammootty reprising his role as  CBI officer Sethurama Iyer along with an ensemble cast. It is the fifth installment of CBI film series. The film was released in theatres on 1 May 2022 and received positive to mixed reviews from critics and audiences alike with praise for Mammootty's performance and the nostalgic moments but criticism for its other performances, writing, length, old-school narration and climax. Still, it went on to become a commercial success at the box office. Plot
  
Aparna is an IPS trainee, who leaves her house for a seminar hosted by the CBI for IPS trainees. DSP Balagopal and Inspector Vinay, two officers from the CBI host the program until they start to talk about several cases that the CBI has handled so far. They discuss a particular case known as the Basket Killings which was successfully investigated by senior CBI officer Sethurama Iyer who is now posted at the CBI Headquarters, Delhi. The case takes place in October 2012 when Home Minister of Kerala state Abdul Samad dies en route to Kerala from Delhi. Many believe his death to be natural circumstances, but some find it mysterious. The suspicions escalate when Samad's personal doctor is also found dead under mysterious circumstances. Protests take place asking the government to order an investigation on the death of Abdul Samad. A journalist named Bhasuran heads these protests and the next day he is found murdered by hanging. A cop named Josemon is also found to be murdered the next day. The police understand that he was murdered by a car that hit and ran over him. The police come to the conclusion that these murders are related and names them the Basket Killings. The case is handed over to DYSP Sathyadas, who is the son of former DYSP Devadas; a corrupt cop and also hates the CBI, particularly Iyer, but the I.G K.C Unnithan is against handing over the case to Sathyadas, citing his corruption. Unnithan shares these concerns with the state police DGP, but he rejects his plea and asks him to wait. Sathyadas finally concludes that the murder of Josemon is linked to a sand trafficker named Sam. Out of suspicion, he takes Sam under custody. Meanwhile, a petition has been moved on court to hand over the case to CBI by Josemon's family. The case is headed by Sathyadas' wife Adv. Pratibha, who seems to have her own reasons for encouraging the petition. At the same time the CBI had also given a workload petition in the court. Later, IG Unnithan requests Balagopal to revisit this controversial decision and to withdraw the workload petition and to bring justice to Josemon's family. So Balagopal meets Sethurama Iyer at CBI Headquarters in New Delhi and they later meet the CBI Director who decides to withdraw the workload petition. The case is eventually handed over to the CBI and Iyer is called upon by the Kerala Government and his associates at the CBI office in Kerala. Iyer reveals that Abdul Samad and the C.M had come to visit him to talk about a youth named Mansoor who was a relative of Samad and that he had joined a militant group some years ago. They focus on Sam and learn that Adv. Pratibha and Sam are acquainted. They question her and she proves that she has no involvement in the killings. They find Sam dead in a remote place after his escape from a hospital earlier while he was under custody. The CBI suspect his death is also a murder, but it is revealed in the forensic reports that his death was due to heart attack. They decide to search Bhasuran's house and they also question his friend. They find evidence that the killer might be a person named Mansoor, and Iyer and his team suspect the involvement of the same Mansoor that was Samad's relative. They also heard this name before from the murdered doctor's wife and his driver as well. During the search Vinay finds a portrait that resembles one of the people he saw in the Delhi Airport CCTV recordings, and learn that his name is Sandeep and that he is linked to DYSP Vikram, a CBI official who is the victim of a murder attempt. Iyer and his team pay him a visit along with DYSP Chacko, a long-time friend of both Iyer and Vikram. Iyer learns from Vikram that Sandeep's actual name is Paul Meyjo. Later they find Meyjo at a private space near a beach. While questioning him they find many designs to a pacemaker and notes describing how to hack a pacemaker. They ask Paul about this and he tells them that he made those to prove his friend, Dr. Venu's claim that a person cannot externally hack a pacemaker. They are forced to release Meyjo due to a lack of evidence. Later, Sathyadas comes to meet Iyer to share with him that he had seen lights coming out of Sam's guesthouse, which was supposedly empty. Iyer decides to investigate and finds that someone was indeed there. Iyer conjectures that murder of Minister Samad was an accident, and the original intended victim had been Susan George, a patient of the late Dr. Venu and also the wife of a renowned doctor, Dr. George Abraham. She is visited by a disguised Meyjo not long before the CBI infiltrate the house to save her. Meyjo tries to flee, before being arrested, and interrogated. They find an article ripped from a newspaper in his bible, which contained a photo to identify Susan. Iyer stays behind to question Susan. Susan was previously named Ambika Unnithan and married to Unnithan. It is revealed that Meyjo was indeed the one who killed Abdul Samad on the orders of Sam and Unnithan. Unnithan had acute schizophrenia and abused his wife, so she left him, but he resolved to eliminate her. After the accidental murder of Samad, Sam and Meyjo decided to kill Dr. Venu as he had grown suspicious of Meyjo. They then killed Bhasuran for organising protests to find the real murderers of Samad's murder. Josemon, who was jogging at that time,  passed through the front gates of Sam's guesthouse to find Unnithan and Sam colluding. The very next day, Sam was ordered by Unnithan to kill Josemon and he in turn instructed Meyjo. He did so by hitting and running his vehicle over Josemon. Iyer visits Unnithan, who boasts that Iyer will never be able to prove that he was the one who ordered Meyjo to commit the murder. Iyer is initially stumped, then suddenly figures out that the newspaper from which Meyjo got the target's photo would be in Unnithan's house. He finds it, and now has physical proof that Unnithan and Meyjo met and discussed plans to kill Susan. Unnithan is arrested, and later died of a heart attack during the trial. Sometime later, Iyer goes to the prison and happens to encounter Meyjo in his cell. Meyjo warns him that Iyer is his next target. Iyer is bemused at his challenge and walks away confidently. Cast

 Mammootty as Sethurama Iyer, SSP/AIG, C.B.I. Mukesh as Chacko, DySP, C.B.I. Jagathy Sreekumar as Vikram, DySP, C.B.I. Saikumar as DySP Sathyadas
 Renji Panicker as Balagopal, DySP, C.B.I. Anoop Menon as I.G. Unnithan IPS
 Soubin Shahir as Paul Meyjo/ Sandeep/ Mansoor
 Dileesh Pothan as Chief Minister of Kerala
 Asha Sharath as Adv. Prathibha Sathyadas 
 Kaniha as Susan George / Ambika Unnithan
 Ramesh Pisharody as Vinay Menon, C.I., C.B.I. Ansiba Hassan as  Anitha Varma, S.I., C.B.I. Prasanth Alexander as  Sudhi Nair, S.I., C.B.I. Sudev Nair as SI Iqbal Hussain
 Jayakrishnan as CI Josemon
 Malavika Menon as Aparna, IPS Trainee
 Kottayam Ramesh as Anwar, Abdul Samad's P. A
 Santhosh Keezhattoor as D.Y.S.P. Babu Raj
 Harish Raj as Sam, a sand contractor 
 Malavika Nair as Josemon's wife
 Swasika as Merlin, Sam's wife
 Prathap Pothen as Dr. George Abraham
 G. Suresh Kumar as Home Minister Abdul Samad
 Ravikumar as C.B.I. Director Nakul Sharma IPS
 Audrey Miriam as Aparajitha
 Rajkumar Sreekumar as Vikram's son
 Arjun Nandhakumar as Anil Thomas
 Krishna as Doctor
 Chandunath G Nair as Bhasuran, an activist
 Durga Nataraj as Arundhathi, Bhasuran's "friend"
 Azeez Nedumangad as Boban (Police Head Constable)
 Sajipathi as Surendran, A.S.I., Kerala Police
 Aniyappan as Police Constable
 Kalabhavan Jinto as Jinto, Sethurama Iyer's driver
 Maya Vishwanath as Abdul Samad's wife
 George oomen    as Groom in Photo
 Sminu Sijo as Muthukkoya's sister
 Pradeep Menon as Dr. Venu
 Sindhu Manu Varma as Dr. Venu's wife
 Idavela Babu as Mammen Varghese
 Lukman Avaran as Muthukkoya

Music
The soundtrack and score is composed by Jakes Bejoy in his first collaboration with Mammootty. The audio rights for the film were bought by Saina. For the main theme of the film, Jakes recreated the original theme from the first film composed by Shyam. Production

Filming
Principal photography commenced on 29 November 2021 at Ernakulam. Mammootty joined the sets on 11 December 2021. Release

Theatrical 
On 29 April Promo of the movie  lighted up on Burj Khalifa. The Movie released on 1 May 2022, as Eid release in theaters. Home media
The digital rights of the film is acquired by Netflix and started streaming from 12 June 2022. The satellite rights of the film is bought by Surya TV. Reception
The movie received mixed to positive reviews with praise to performances of Mammootty and Saikumar and the appearances of Mukesh and Jagathy Sreekumar. The Times of India rated the movie 4.5/5 and commented that "A tantalising and twisty crime thriller" along with the advice of "Just stay away from spoilers as smartly as you can!". Indian Express commented "Mammootty effortlessly transforms into Sethurama Iyer in an intelligently woven script". Anna M. M. Vetticad from Firstpost wrote "Instead of staying true to the original's tone, CBI 5 throws bombastic and stilted lines into the mix in what appears to be a misplaced attempt at contemporisation" The Hindu commented "Not a worthy sequel to a memorable series".The News Minute reviewed that " Mammootty retains Sethurama Iyer's traits, but can't save film." Box office 
CBI 5: The Brain, earned a gross collection of  in Overseas and India. References

External links
 

2020s Malayalam-language films
Indian mystery films
Films scored by Jakes Bejoy
Indian sequel films
CBIDiary5
Indian mystery thriller films
Films with screenplays by S. N. Swamy
Central Bureau of Investigation in fiction
2022 thriller films
2022 films