As Bollywood superstar, Akshay Kumar turned 51 today, he had a special treat in store for fans- a fresh poster of his upcoming sci-fi film '2.0' starring Rajnikanth. Writing how the character of a dark superhero has been the most powerful for him, the 'Gold' star revealed the poster showcasing his menacing avatar.

"Here¿s a special birthday treat for all my fans. Sharing with you my most powerful character & one which has probably stayed with me for the longest time. I am the dark superhero for those who don¿t have a voice! HUMANS BEWARE!" read the caption.