'Once Upon a Time': Emma protests Regina going undercover | EW.com 

When Regina (Lana Parrilla) goes undercover to infiltrate the Queens of Darkness on Sunday’s episode of

, a surprising ally will try to convince her against it: Emma (Jennifer Morrison).

Fortunately, by that time, Regina has already learned that Maleficent (Kristen Bauer van Straten) & Co. are after the Author, and are planning to use Regina to steal a piece of information that could help them locate him. How will Emma react? Find out in our exclusive sneak peek.

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