Following Singappenney and Verithanam, the third single from Bigil, Unakaga was launched this evening. The song announcement was made by the film's director Atlee, via his official Twitter handle, along with a song poster, featuring Vijay and Nayanthara. The background of the picture and the colour tone are reminiscent of Neethanae from the actor-director duo's previous film, Mersal. 

Unakaga has been sung by Sreekanth Hariharan and Madhura Dhara Talluri, and its lyrics penned by Vivek. 

The remaining songs from the film, with music by AR Rahman, will be launched tomorrow at a grand event at Leo Muthu Indoor Stadium in Chennai. 

Bigil, which is slated to hit the screens for Diwali, also stars Anandraj, Jackie Shroff, Daniel Balaji, Indhuja Ravichandran, Varsha Bollamma, Amirtha Aiyer, and Reba Monica John. The film has cinematography by GK Vishnu and editing by Ruben.