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In page Once Upon a Time (TV series):

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The first season premiered as the top-rated drama series. The pilot episode was watched by 13 million viewers and received a 4.0 rating/share among 18- to 49-year-olds.[1] It was the season's highest-rated drama debut among the age range and ABC's biggest debut in five years.[2][3] With DVR viewers, the premiere climbed to 15.5 million viewers and a 5.2 rating/share in adults 18–49.[4] The show's next three episodes had consistent ratings every week with over 11 million viewers.[5][6][7] The series became the number one non-sports program in the U.S. with viewers and young adults on Sunday nights.[8]