Megastar Mammootty's upcoming film 'Unda' to be directed by Khalid starts rolling today. 'Unda' is the second directorial venture of Khalid Rehman, who had made an impressive debut with Anuraga Karikkin Vellam which hit the screens in 2016. Unda will be produced by Krishnan Sethukumar under the banner Movie Mill in association with Gemini Studios. Gavemic U Ary will handle the cinematography and Prashanth Pillai will be scoring the music.