LOS ANGELES -- Imagine discovering that the nanny caring for your children isn't who she claims to be!

That's the chilling premise of Hulu's "The Hand That Rocks the Cradle," starring Mary Elizabeth Winstead and Maika Monroe.

The film had its world premiere at the Walt Disney Studios lot in Burbank, California and On The Red Carpet spoke with the stars!

Monroe called the role "probably the most fun that I've had in a role in a long time because I got to play the villain."

"We got to kind of live in a house as this almost happy family for a while before things start turning sinister," said Winstead.

"It was so cool to be able to play that out in real time, like just get to show up and enjoy each other's company, getting to know one another and then slowly have Maika coming in and star

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