New Trailer: 'Pacific Rim' Monster Mash

Warner Bros.

There's more monster-mash action in the main trailer for Guillermo del Toro's sci-fi thriller Pacific Rim, and we've got a first look!

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The Hellboy director's love letter to the giant monster movies of his youth finds a whole new race of fierce creatures -- called Kaiju -- who emerge from the Pacific to wreak havoc on our cities. The only way to defeat the relentless opponents is by building a fleet of giant robots -- called Jaegers -- to clash with the titans.

With the human race on the verge of defeat, the forces defending mankind have no choice but to turn to two unlikely heroes -- a washed up former pilot (Charlie Hunnam) and an untested trainee (Rinko Kikuchi) -- who are teamed to drive a legendary but seemingly obsolete Jaeger from the past. Together, they stand as mankind's last hope against the mounting apocalypse.

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Also starring Idris Elba, Charlie Day, Ron Perlman and Clifton Collins, Jr., Pacific Rim stomps into theaters in 3D and 2D in select theaters and IMAX on July 12.