Director Brett Ratner is the latest casualty of the beleaguered Superman movie.

Ratner cited the tortured casting process for the projected trilogy -- Brendan Fraser, Jude Law and Josh Hartnett have all spurned the chance to play the Man of Steel -- as his reason for leaving.

The final straw seems to have been the unwillingness of Warner Bros. honchos to approve his choice of soap star Matthew Bomer to play the role.

Variety reports the studio had become uncomfortable with Ratner's decision-making style as well as the ballooning $225 million budget.

Though now bereft of both director and superhero, Warner says it will move forward with Superman, while Ratner will helm Rush Hour 3.