A Big Blow to the "Superman" production with news that Director Brett Ratner has officially left the project. The Hollywood Reporter says that after siix months after coming aboard to direct the film Ratner packed his bags. "I have chosen to withdraw as director of ‘Superman,’ " Ratner said. "The difficulty of casting the role of Superman has contributed to my decision. I appreciate the efforts of Warner Bros. and the entire production team during this process." Last month, Josh Hartnett screen-tested for the role, but despite an offer to play Superman, he balked at the commitment to doing three consecutive features. By the end of February, a new trio of actors emerged as top choices: Brendan Fraser, Paul Walker and newcomer Matthew Bomer. All three screen-tested, but two weeks ago, Walker pulled himself out of contention before Warner Bros. president Alan Horn could view all three candidates. Fraser and Bomer remained in the mix, but Ratner’s option expired Saturday, and the studio and remaining two actors parted ways.