AMC's "The Walking Dead" on Sunday made an impressive fourth-season debut, breaking its own cable-entertainment audience record and establishing itself as the most popular series on any TV network among the 18-to-49 audience. "The Walking Dead" attracted an audience of 16.1 million viewers, compared with its previous high of 12.4 million viewers, and scored 10.4 million viewers among the 18-to-49 demographic.

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