When an opportunity arises to chaperone a school excursion alongside the charming and enigmatic teacher, Miss Caroline (Lupita Nyong'o), directionless slacker Dave (Alexander England) jumps at the chance to impress her. What wasn t on the itinerary was obnoxious children s television host Teddy McGiggle (Josh Gad) and a zombie invasion after experiments at a nearby military base go awry. Together the trio must keep their heads together, don t freak out the kids and fight their way to safety with their guts intact.