'Dune: Prophecy' episode 3 reveals Tula Harkonnen's shocking backstory. Emma Canning breaks down that devastating twist.

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emma canning as tula harkonnen in dune prophecy. she's wearing her brown hair loose and a sheer, white top, and sitting on the forest floor and crying
Emma Canning as Tula Harkonnen in episode three of "Dune: Prophecy."

Attila Szvacsek/HBO

The 15 best things to watch this weekend, from 'Deadpool & Wolverine' to the series premiere of 'Dune: Prophecy'

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Deadpool and Wolverine on a television screen

Jay Maidment/20th Century Studios, Marvel Studios, BI

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