Tula Harkonnen sees a large ox in a pivotal scene in Dune: Prophecy episode 3, which has significant thematic meaning for House Harkonnen. 10,000 years earlier than Denis Villeneuve's movies on Dune's timeline, House Harkonnen and House Atreides are still at each other's throats. Actors Olivia Williams and Emma Canning play Tula Harkonnen at different ages in Dune: Prophecy's cast, exploring a complex supporting character who's willing to commit extreme acts for her family, as exhibited by the mass murder of Orry Atreides and other members of his family in episode 3.

Dune: Prophecy's episode 3's ending shows how both sisters, Valya and Tula, are willing to commit drastic acts in the name of their families or for self-service. The younger Tula travels to Caladan, where she forms a romantic bond with young Orry Atreides, swearing her love to him under the guise of a different name. By the...