August 24, 2015 5:05 PM EDT

AMC has nothing to fear from Sunday night’s ratings.

The Walking Dead’s companion series got off to a huge start last night.

According to AMC, the series premiere of Fear the Walking Dead delivered 10.1 million viewers and an incredible 6.3 rating among adults 18-49.

That makes Fear the biggest premiere in cable TV history in both total viewers and key demos.

The prequel series tells the story of a Los Angeles family at the beginning of the zombie apocalypse.

The flagship Walking Dead series debuted to 5.4 million viewers back in 2010 (which was considered quite high at the time). The show’s ratings have grown every year since, with the most recent fifth season premiering to a record 17.3 million viewers last fall.

For more, check out EW’s recap of Fear the Walking Dead and our interview with showrunner Dave Erickson. And is “Where’s Nick?” the new “Where’s Carl?”


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