Aliens, zombies and sex -- what’s not to like?

JUST how funny you’ll find “Invasion! The Musical” depends on your affinity for the kind of humor that appeals primarily to drunk undergraduates. Which is to say, anything involving cleavage, virgins, genitalia, homosexuality and uncontrollable flatulence.

Cheerfully obscene, this adults-only musical spoofs the age-old alien-invasion genre. When a UFO starts turning the citizens of a New Mexico suburb into zombies, it’s up to Becky Brewster (Kate Feld), a buxom blond high schooler, to rally the townsfolk and defend the peace. Becky joins forces with the racist town sheriff (Will Harris), an alcoholic priest (Matt Falber), a lesbian anchorwoman (Jenny Weaver) and a nebbishy doctor (Aaron Matijasic).

The show amounts to a spiritual splicing of “Invasion of the Body Snatchers” and “Porky’s.” When the characters aren’t busy fleeing the aliens, they’re busy engaging in all kinds of non-procreative sexual congress.

The songs (written by Matijasic and Billy Thompson) feature some of the most creative profanity you’ll likely hear this season. While most of the gags are executed in harmless tongue-in-cheek style, the show flirts dangerously -- and somewhat uneasily -- with a few controversial topics, as in a Broadway-style number about incest (“It don’t count if it’s Daddy!”).

To bemoan the show’s utter lack of taste is to miss the larger point, of course. “Invasion!” is a celebratory embrace of everything low-brow and offensive. In many ways, it’s an assault on audience indifference. By the time Becky launches into a ballad about toxic shock syndrome while dancers swing large fluffy tampons around the stage, you’re either having a blast or you’ve checked out long ago.

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david.ng@latimes.com

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Invasion!

The Musical

Where: Hudson Backstage Theatre, 6539 Santa Monica Blvd., Hollywood

When: 8 p.m. Fridays and Saturdays., 7 p.m. Sundays

Ends: Sept. 23

Price: $25

Contact: (323) 960-7612 or www.InvasionTheMusical.com

Running time: 2 hours, 30 minutes