"The first scenes featured in the trailer, depicting a young girl witnessing a Kaiju attack, are not the first scenes you’ll see in "Pacific Rim.” The sequence actually takes place in the middle of the film, a flashback that reveals the history of co-lead Mako Mori (played by Rinko Kikuchi), who lost everything to the Kaiju.
"This is how she decided to fight Kaijus, and what happened to her as a kid," del Toro explains."
When alien life entered our world, it was from deep beneath the Pacific Ocean. A fissure between two tectonic plates. A portal between dimensions. The Breach. I was fifteen when the first Kaiju made land in San Francisco.