EXCLUSIVE: 'Once Upon a Time' Stars Reveal Behind-the-Scenes Secrets From the Musical Episode! Video:

Only ET has exclusive details from Jennifer Morrison, Colin O'Donoghue and more magical stars about 'Once Upon a Time's musical episode, airing Sunday, May 7, at 8 p.m. ET on ABC!

Published Wed, 03 May 2017 09:05:11 UTC

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