: The episode establishes a dual timeline. It begins with a flashback to a young Valya Harkonnen (Jessica Barden) promising the dying Mother Superior Raquella that she will protect the Sisterhood's vision. Thirty years later, Mother Superior Valya (Emily Watson) manages a secret breeding program and schemes to place a Sister on the Imperial Throne through Princess Ynez Corrino .
As the Imperial Court on Salusa Secundus teeters under the weak rule of Emperor , a mysterious assassination attempt using forbidden thinking-machine technology suggests a conspiracy older than the Imperium itself. Valya discovers that the "Prophecy" — a genetic memory virus implanted in key bloodlines — is beginning to awaken ahead of schedule, threatening to reveal the Bene Gesserit’s darkest secret: that many of their so-called "revelations" are engineered, not divine. dune: prophecy s01e01 360p