Mammootty is back and is playing the iconic character Sethurama Iyer once again.

The first reviews of the film are out on social media and CBI 5: The Brain has opened to a pretty good response.

The audience is impressed by the first half of the film, it has a good turn of events.

A Twitter user wrote, "A Good First Half with mainly setting up the plot..@mammukka's majestic walk with that bgm So far Good..All eyes to the Secondhalf..! Highly Unexpected kinda making from K.Madhu."

The 5th part is directed by K Madhu and written by SN Swamy, and has been released on the big screens, 35 years after the first part.

The soundtrack and score for the 5th part is composed by Jakes Bejoy in his first collaboration with Mammootty, Produced by Swargachitra.

CBI: The Brain comes after Mammootty's Bheeshma Parvam, which was released recently.