The films' teaser featured the song "American VI: Ain't No Grave" by American musician Johnny Cash. It was the first time that an English track was being used in a Malayalam film. The makers also gave credit to Cash's song claiming that "It has been used for teaser purposes only". The teaser went viral, and received praise for incorporating the song, which perfectly sets the action-thriller tone of the film. "The idea of using the song came during the editing stage, and I thought it truly complemented the Mexican-style footage that was used for the teaser. Though the song is a free template that's been made available by its producers to be used by anyone, we have also given the due credit.", says Ravi. Cash often performed wearing dark clothing, earning him the nickname 'The Man in Black.' Mohanlal's character is also seen wearing a black attire in the teaser and the stills.
