Williams is taking over the role of Tula Harkonnen following Shirley Hendersons exit in February.
Foerster is taking over duties following Johan Rencks exit whichDeadline announced exclusivelyearlier this year.
The series is adapted from the novelSisterhood of Dune, written by Brian Herbert and Kevin J. Anderson.
L to R: Olivia Williams, Jodhi May and Anna Foerster
Watch on Deadline
Diane Ademu-John serves as creator, writer, and executive producer.
Alison Schapker serves as showrunner and executive producer.
Kevin J. Anderson is co-producer.
Williams is repped by Independent Talent Group, CAA and Schreck Rose Dapello, et al.
May is repped by Accelerate and APA.
Foerster is repped by WME and Paul Hastings, LLP.
