The trailer for Zack Snyder's adaptation of Alan Moore's classic graphic novel Watchmen has just been leaked to YouTube and now you can catch it here.

Watchmen is set in an alternate 1985 America where costumed heroes are a part of the world's history, and the "Doomsday Clock", which measures the tension between the USA and the U.S.S.R. is constantly at five minutes to midnight. Rorschach, a vigilante who refused to retire when his teammates did, is drawn out by the murder of one of his colleagues, and pulled into a world-wide conspiracy with terrifying implications for the future of mankind.

Watchmen stars Patrick Wilson, Billy Crudup, Jeffrey Dean Morgan, Jackie Earle Haley, Malin Akerman, Matthew Goode, Stephen McHattie, Carla Gugino and Matt Frewer. The film hits theatres March 10, 2009.