The season finale of a drama series that has been shattering basic cable viewing records added to its record run, with 9 million viewers tuning in to watch the zombie battle in Sunday’s finale of AMC’s "The Walking Dead," reports The New York Times’ Media Decoder.

An additional 1.5 million viewers watched a repeat of the episode that aired later that night, the story notes.

Among the show’s initial 9 million viewers, which made the episode the program’s most watched installment, were 6 million people age 18 to 49, the article adds.

"The Walking Dead" has set viewing records this season, becoming the highest-rated drama on a basic cable channel in all important demographics, such as viewers 18 to 49 and 18 to 34, the piece notes.

Historically, the only cable drama to consistently beat the numbers for "The Walking Dead" in total viewers was premium channel HBO’s "The Sopranos," which reached as many as 13.4 million viewers for the first airing of individual episodes, the piece adds.