As for the hops&horrors beer pairing, the setting for this movie is San Francisco, and my first hops&horrors pick for you would be 21st Amendment's, Bitter American. A perfect pairing since the brewery is in San Francisco (the setting in the movie) and it features a space chimp (a conspiracy theorist's favorite "point of origin" scape goat) on the label. I'm sure the chimp teased those dirty aliens and that's why they are now taking over out planet.
You may have trouble tracking down Bitter American outside of San Francisco, but fear not, there is plenty of good SF beer to pair with this movie. Anchor Steam Beer would a perfectly good substitute and one that you can probably find at your local beer store.