The trailer focuses on Charlie Hunnam and Rinko Kikuchi preparing to take the Jaegar robot into battle.
Guillermo del Toro's film is set in a future where mankind is menaced by monsters called Jaegars that have risen from the ocean.
Humanity's only hope rests in an old Jaegar piloted by a washed up veteran (Hunnam) and an unproven rookie (Kikuchi).
Idris Elba, Ron Perlman, Charlie Day, Robert Kazinsky, Max Martini, Clifton Collins Jr, Burn Gorman, Larry Joe Campbell, Brad William Henke and Diego Klattenhoff will also feature in the movie.
Del Toro has spoken out against rumours of poor box office predictions, saying that the movie is "on the right track".
Pacific Rim will open in 3D, IMAX 3D and 2D cinemas on July 12.
Pacific Rim - photo gallery: