Mouni Roy says her casting as the main antagonist in Ranbir Kapoor-Alia Bhatt-starrer "Brahmastra" came as a surprise for her. The 33-year-old actor, who made her Bollywood debut with Akshay Kumar's "Gold", says she wants to make versatile choices.

"I am playing the main villain in the film. I am really looking forward to it. What is more liberating for me is playing different characters that challenges me. I was surprised initially that they wanted me to play the villain. "Ayan Mukherji (director) had seen something from 'Naagin' and felt I could play the villain. So you never know what clicks with whom. As an actor you should be willing to experiment and be versatile otherwise you can't learn and grow," Mouni told PTI. "Brahmastra" also featuring megastar Amitabh Bachchan, will serve as the first film in the trilogy. Mouni says working with the team has been an enriching experience.