If Charlie Hunnam seems to deliver a robotic performance in "Pacific Rim," that can be forgiven. After all, he's pretty much playing a robot. The trailer for Guillermo del Toro's highly anticipated action flick "Pacific Rim" hit the internet today, giving geeks everywhere an idea of what to expect from the sci-fi offering. The film, which stars Hunnam, Idris Elba, Charlie Day, Ron Perlman and Rinko Kikuchi, explores a world where humans employ huge robots to fight off an alien invasion -- and, if the trailer is any indication, do nearly as much damage as the animals do in the process. Check out the trailer below.