The zombie genre may be shambling on long past its expiration date, but there’s still always room for another good zom-com.

Unfortunately, “Little Monsters” doesn’t have too many ideas beyond casting Lupita Nyong’o as an undead-slaying and ukulele-playing kindergarten teacher.

Who knows why the Oscar-winning talent agreed to do this Aussie indie, but her relentlessly cheerful, blood-soaked performance is by far the best thing about this story of a slacker musician (Alexander England), a sleazy kids’ show host (Josh Gad) and a classroom of tots trapped at a petting zoo during a zombie apocalypse.

Director-writer Abe Forsythe (“Down Under”) nails a handful of funny juxtapositions, but too often leans into mean-spirited and tired yuks. As far as red flags for lameness go, fat-kid and pooping your pants jokes are, well, dead giveaways.