After a 20-year hiatus, George A. Romero resumes his quasi-satiric horror series about the flesh-eating living dead. Land of the Dead, his fourth entry, turns out to be his most conventional as an action thrillerthough it’s every bit as gory as the others and more clearly class conscious. By now the subproletarian zombies have taken over everything except a gated city run by scheming villain Dennis Hopper (surprisingly cliched here); spurred on by a leader of sorts (Eugene Clark), a former filling-station attendant, they’re beginning to think a little as they attack. This being contemporary, the reprisals are military. With Simon Baker, John Leguizamo, Asia Argento, and Robert Joy. R, 93 min. (JR)