NEW YORK (AP) — The zombies keep getting stronger.
AMC's hit "The Walking Dead" set a series record Sunday night with 12.3 million viewers. The show was returning from a hiatus, and the Nielsen Co. said it beats the series' previous record of 10.9 million for its third season debut last October.
More than half of Sunday's viewers, or 7.7 million, were in the youthful demographic of people ages 18 to 49. Nielsen says a cable series has never reached that big an audience in that age group.