Bollywood's box-office king Rohit Shetty is back with his Golmaal pair - Ajay Devgn and Kareena Kapoor. The first trailer of Singham Returns - sequel to 2011's Singham - was launched on Friday. In the trailer, Ajay is seen battling villainous forces and even some political parties to eradicate the menace of black money. The movie releases on August 15.