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Rihanna plays Petty Officer (GM2) Cora Raikes

RiRi gets into her role with gusto

Brooklyn Decker plays physical therapist Samantha Shane

That's a determined walk Rihanna - where are you going?

Now concentrate Rihanna

An alien invader attacks

An alien invader is spotted in the Pacific - can't miss it!

(L to R) Nagata (Tadanobu Asano) and Hopper (Taylor Kitsch) try to escape an attack

RiRi fights the alien attackers

(L to R) Taylor Kitsch as Hopper and director/producer Peter Berg

Taylor Kitsch plays Lt. Alex Hopper, a Naval officer assigned to the USS

Brooklyn Decker and Taylor Kitsch embrace - so the film is not only about aliens - there's a bit of romance as well