Sachin Singh is an Indian soldier, and a Champion in the Fourth Great Games of the Hydra.
Captain Sachin Singh of India's MARCOS special forces unit had apparently built up a reputation as a great soldier, and because of this he was selected by the King of the Underworld, Anthony DeSaxe, to be one of his four representing Champions during the Great Games of the Hydra.
It is unknown if Singh was unaware of this decision or even of the existence of the Games; either way, a short time before the Games were set to commence, he was taken to the Underworld, along with a few of his friends/family who were to be his hostages, and had an explosive device implanted in his neck.
Singh, like the other participants in the Games, awoke in a strange cell to find himself confronted by a strange man in a bull-shaped helmet. After killing his opponent, Singh ventured out of the cell to find himself among thirteen others who had succeeded against their enemies. They were then all confronted by the man calling himself Hades, who explained that they were all participants in the Great Games of the Hydra.