The zombie apocalypse is nigh if you venture to Universal Studios, where this year’s Halloween Horror Nights features the doomsday setting of season four of the popular AMC series “The Walking Dead.” The “End of the Line” maze forces you through the bloody debris of the prison that once sheltered you from the zombie virus to search for the safe haven of Terminus, while the “Welcome to Terminus” Scare Zone is a horrific odyssey through a gantlet of flesh-hungry monsters to humankind’s last chance for survival.