Joe Otterson TV Reporter The “Dune” prequel series at HBO Max from Legendary Television has cast Emily Watson and Shirley Henderson in lead roles, Variety has learned. Officially titled “Dune: The Sisterhood,” the series was ordered at HBO Max in June 2019. The show is set 10,000 years before the events of “Dune” and is based on the novel “Sisterhood of Dune” by Brian Herbert and Kevin J. Anderson. Per the official logline, the show “follows the Harkonnen Sisters as they combat forces that threaten the future of humankind, and establish the fabled sect known as the Bene Gesserit” Watson will play Valya Harkonnen and Henderson will play Tula Harkonnen. The character descriptions say the two sisters “have risen to power in the Sisterhood, a secret organization of women who will go on to become the Bene Gesserit.”