It has been widely speculated that Vijay plays a triple role in Mersal; however, the team has not officially confirmed this news till date. It is certain, Vijay has three characters in the film, a village head, a doctor and a magician. Rumors suggested that the magician Vijay might do a con act as a physician, but this frame from the teaser makes us believe that it is a triple role.

If you could pause exactly at 21 seconds of the teaser, you would notice, one Vijay being held by a thug with a gang of terrifying goons around. It clearly says, he is struggling and badly needs help. But exactly a micro-second later you could see, one of the thugs in the gang being hit from nowhere. How is that possible when Vijay is struggling? In a Vijay film, when Vijay is struggling, who else could save him unless it is another Vijay? 

If you could connect that frame to the previous shot at 20 seconds, you could see the back side of Vijay in the same location but with a different costume and coolers. He is seen hitting the very same gang of thugs. So we presume when the doctor Vijay is getting kicked, the magician Vijay comes to the rescue.

This is just our theory, and we could be wrong!