Halloween Horror Nights: What to Expect at Universal Orlando Resort's Annual Halloween Scare Fest. Every year, Universal morphs into the stuff of nightmares when Halloween Horror Nights takes over on select evenings. Halloween Horror Nights comprises nine houses and five scare zones with eight-hundred actors playing the parts of zombies, slashers, clowns, vampires, dead vampires, there to scare. The perfect way to celebrate Halloween! Camels and Chocolate. Travel in North America.