Dune: Prophecy's latest episode exposes House Harkonnen's fatal flaw: that even the noblest of members can be corrupted in the pursuit of revenge.

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.

Prophecy digs into the origins of the feud between the Atreides and the Harkonnens, which eventually ends with Paul Atreides.