In this third installment, "Sisterhood Above All," we begin with a shellshocked Valya exiting the palace gates on Salusa Secundus with Sister Theodosia. Fearing that the Sisterhood's hold on the great houses is quickly slipping, they must act fast to regain control, especially with the Emperor's House Corrino.

Dune: Prophecy takes a deep dive into the lives of Valya and Tula Harkonnen, ending with a sequence where Valya visits her uncle and nephew. Actors Emily Watson and Jessica Barden play Valya Harkonnen,

Sisterhood above all” is the mantra. And it’s not like the Harkonnen sisters don’t believe in it. But Tula has her own agenda, too, just like Valya. They are aligned in their ongoing purpose, one that will combine their personal aims with the Imperium-maneuvering machinations of the reverend mothers.

Episode three of Dune: Prophecy looks back at Valya and Tula's past, providing the show's richest character drama yet.

By looking back at Valya and Tula's past, we get a glimpse into who they really are and why they are so desperate to gain power in the Imperium.

Prophecy season one, episode three, "Sisterhood Above All," the series shows us flashbacks of Valya and Tula Harkonnen's past.

The Sisterhood. The sisterhood in question refers to the manipulative nuns known as Truthsayers, but it could just as easily refer to the two most important characters in the show: Valya and Tula Harkonnen.