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Siân Phillips
★ Acting

Siân Phillips

Born 1933 · Gwaun-Cae-Gurwen, Glamorgan, Wales · Active 1951–2025

Siân Phillips, born in 1933 in Wales, has made a significant impact in the realm of cult cinema with her roles in Dune (1984) and Valmont (1989). Known for her commanding presence, she plays the enigmatic Reverend Mother Gaius Helen Mohiam in Dune, a character that embodies the film's intricate power dynamics. Phillips' theatrical roots, honed at RADA alongside contemporaries like Diana Rigg, inform her performances, adding depth to her portrayals in both films. Her contributions to these titles highlight the unique blend of artistry and genre that defines SassyFlix's catalog.

▶ Watch on SassyFlix 2 films available
Dune

Dune

1984 ★ 6.3
as Reverend Mother Gaius Helen Mohiam

In the far future, the known universe is ruled by Padishah Emperor Shaddam IV. The most valuable substance in the empire is the drug melange or "spice", which extends life and expands consciousness. The spice also allows the Spacing Guild to fold space, permitting safe, instantaneous interstellar travel. The Guild fears a conspiracy that could jeopardize spice production and sends an emissary to demand an explanation from the Emperor, who reveals his scheme to destroy House Atreides. The Emperor fears Duke Leto Atreides' growing popularity—and a secret army he is reportedly amassing—threaten his rule. He plans to cede control of planet Arrakis (also known as Dune), the universe's only source of spice, to House Atreides. Once they are installed there, the Atreides will be ambushed by their longtime archenemies, the Harkonnens, with help from the Emperor's elite Sardaukar troops. The Guild Navigator commands the Emperor to kill Duke Leto's son, Paul Atreides, because the Guild fears he may somehow threaten spice production. The execution order draws the attention of the Bene Gesserit sisterhood, since Paul is tied to their centuries-long breeding program to produce the Kwisatz Haderach, the universe's superbeing. Before Paul leaves for Arrakis, he is tested by the Bene Gesserit Reverend Mother Mohiam by being forced to place his hand in a box which induces excruciating pain. To Mohiam's surprise and eventual satisfaction, he passes the test. On the industrial world of Giedi Prime, the sadistic Baron Vladimir Harkonnen tells his nephews Glossu "The Beast" Rabban and Feyd-Rautha about his plan to eliminate House Atreides by manipulating someone in the Duke's orbit to betray him. The Atreides leave their homeworld Caladan for Arrakis, a barren desert planet populated by gigantic sandworms. The native people of Arrakis, the Fremen, prophesy that a messiah will lead them to freedom. Duncan Idaho, one of Leto's loyalists, tells him that he suspects Dune holds vast numbers of Fremen who could prove to be powerful allies. Before Leto can form an alliance with the Fremen, the Harkonnens launch their attack. The Harkonnens' traitor within House Atreides, Dr. Wellington Yueh (Leto's personal physician), disables critical shields and destroys sonic weapons, leaving the Atreides nearly defenseless. Idaho is killed, Leto is captured, and nearly all of House Atreides is wiped out by the Harkonnens. Baron Harkonnen has Mentat Piter De Vries kill Dr. Yueh with a poisoned blade. Leto dies in a failed attempt to assassinate the Baron Harkonnen using a poison gas tooth implanted by Dr. Yueh. After being wounded by Yueh, Leto let him install the tooth in exchange for sparing the lives of Lady Jessica, his concubine, and Paul. Paul and Jessica survive the attack and escape into the deep desert, where they are given sanctuary by a sietch of Fremen. Paul assumes the Fremen name Muad'Dib and emerges as the leader for whom the Fremen have been waiting. He teaches them to build and use Weirding Modules—sonic weapons developed by House Atreides—and targets spice mining. Over the next two years, spice production is nearly halted. The Spacing Guild informs the Emperor of the deteriorating situation on Arrakis and demands he rectify it. Paul falls in love with Chani, a young Fremen warrior. Jessica becomes the Fremen's reverend mother by ingesting the Water of Life, a deadly poison which she renders harmless by using her Bene Gesserit abilities. In a prophetic dream, Paul learns of the plot by the Emperor and the Guild to kill him. He also sees that they fear he will consume the Water of Life. When Paul's dreams suddenly stop, he drinks the Water of Life and has a profound trip in the desert. He gains powerful psychic powers and the ability to control the sandworms, which he realizes are the spice's source. The Emperor amasses a huge invasion fleet above Arrakis to wipe out the Fremen and regain control of the planet. He has "The Beast" Rabban beheaded and summons Baron Harkonnen to explain why spice mining has stopped. Paul launches a final attack against the Harkonnens and the Emperor's Sardaukar at Arrakeen, the capital city. Riding atop sandworms and brandishing sonic weapons, Paul's Fremen warriors easily defeat the Emperor's legions. Paul's sister Alia mortally wounds Baron Harkonnen, who is sucked through a breached palace wall and into the mouth of a sandworm. Paul confronts the defeated Emperor and fights Feyd-Rautha in a duel to the death. After killing Feyd, Paul demonstrates his newfound powers and fulfills the Fremen prophecy by causing rain to fall on Arrakis. Alia declares him to be the Kwisatz Haderach.

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Career Highlights Top 6 by popularity · TMDB

Filmography

120 credits
2020s 17 credits
2025
Movie ★ 7.5
2024
Movie ★ 8.0
2024
Movie ★ 6.0
2024
Doctor Who as Enid Meadows
TV ★ 6.4
2024
TV ★ 8.0
2023
Movie
2022
Movie ★ 8.0
2022
TV ★ 6.3
2022
TV
2021
National Theatre Live: Under Milk Wood as Mrs Utah Watkins / Polly Garter / Mrs Beyon
Movie
2021
Dream Horse as Maureen
Movie ★ 7.0
2021
TV
2021
Wonders of the Celtic Deep as Self - Narrator
TV
2020
A Christmas Carol as Grandmother / narrator (voice)
Movie ★ 7.5
2020
Summerland as Margaret Corey
Movie ★ 7.5
2020
McDonald & Dodds as Agnes Gillian
TV ★ 7.6
2010s 15 credits
2019
Movie ★ 5.5
2019
Time & Again as Eleanor
Movie ★ 9.0
2019
Movie ★ 6.0
2019
Good Omens as Mr. Henderson
TV ★ 8.0
2018
Voyageuse as Erica
Movie ★ 7.3
2018
Miss Dalí as Anna Maria Dalí
Movie ★ 5.7
2018
Movie ★ 8.0
2018
Nureyev as Narrator
Movie ★ 7.3
2017
Movie ★ 5.1
2016
Movie ★ 6.3
2014
Under Milk Wood as Mrs. Pugh
Movie ★ 6.0
2012
Movie
2012
Lovesong as Maggie
Movie
2012
TV ★ 6.0
2000s 10 credits
2004
The Murder Room as Marie Strickland
Movie ★ 6.5
2003
Movie ★ 7.0
2003
Movie ★ 9.0
2003
Check the Gate: Putting Beckett on Film as Self - Ru (archive footage)
Movie ★ 10.0
2003
The Last Detective as Vera Dulciman
TV ★ 7.8
2002
Movie ★ 7.0
2001
Attila as Grandmother
TV ★ 6.3
2000
Movie ★ 6.0
2000
Movie ★ 6.7
1990s 24 credits
1999
Aristocrats as Narrator/Older Lady Emily Lennox
Movie ★ 6.0
1999
TV ★ 6.0
1998
The Scold's Bridle as Mathilda Gillespie
Movie ★ 6.4
1998
Movie ★ 5.2
1998
TV
1997
Movie ★ 5.7
1997
TV ★ 7.5
1997
Arthouse as Self - Commentary
TV
1997
Ivanhoe as Queen Eleanor of Aquitaine
TV ★ 7.1
1997
Midsomer Murders as Lady Annabel Butler
TV ★ 7.5
1996
Silent Witness as Beattie Elletson
TV ★ 7.5
1995
Movie ★ 5.0
1995
Movie ★ 10.0
1993
The Age of Innocence as Mrs. Archer
Movie ★ 7.0
1993
TV ★ 6.7
1993
Heidi as Frau Sesemann
TV ★ 7.1
1993
The Sherman Plays as Self - Introduction
TV
1992
The Borrowers as Mrs. Driver
TV ★ 6.7
1991
The Chestnut Soldier as Nain Griffiths
Movie ★ 7.0
1991
The Black Candle as Daisy Barnett
Movie ★ 5.0
1990
Emlyn's Moon as Nain Griffiths
Movie ★ 8.0
1990
Dark River as Mrs. Blessington
Movie ★ 10.0
1990
Perfect Scoundrels as Mother Aloysius
TV ★ 6.0
1990
Red Empire as Narrator (voice)
TV ★ 9.0
1980s 17 credits
1989
Valmont as Madame de Volanges
Movie ★ 6.7
1989
David Macaulay: Pyramid as Mersyankh (voice)
Movie
1989
Agatha Christie's Poirot as Mrs. Laura Upward
TV ★ 8.2
1989
Shadow of the Noose as Lady Scott
TV ★ 9.0
1988
The Snow Spider as Nain Griffiths
Movie ★ 9.5
1987
The Two Mrs. Grenvilles as Duchess of Windsor
TV ★ 5.0
1987
Vanity Fair as Matilda Crawley
TV
1987
A Killing on the Exchange as Isobel Makepeace
TV ★ 5.0
1985
Movie ★ 5.4
1985
The Doctor and the Devils as Annabella Rock
Movie ★ 6.2
1984
Dune as Reverend Mother Gaius Helen Mohiam
Movie ★ 6.2
1982
How Many Miles to Babylon? as Mrs Alicia Moore
Movie
1981
Clash of the Titans as Cassiopeia
Movie ★ 6.9
1981
TV ★ 6.3
1980
Nijinsky as Lady Ripon
Movie ★ 4.9
1980
Carpathian Eagle as Mrs. Henska
Movie ★ 4.8
1980
TV ★ 7.1
1970s 15 credits
1979
TV ★ 6.8
1979
Crime and Punishment as Katerina Ivánovna
TV ★ 8.0
1979
TV ★ 7.6
1978
Warrior Queen as Queen Boudicca
TV ★ 6.7
1977
Heartbreak House as Hesione Hushabye
Movie
1977
The Achurch Letters as Janet Achurch
Movie
1976
I, Claudius as Livia
TV ★ 7.9
1975
TV ★ 6.7
1974
Jennie: Lady Randolph Churchill as Mrs. Patrick Campbell
Movie ★ 8.0
1974
Shoulder to Shoulder as Emmeline Pankhurst
TV ★ 6.5
1974
Playhouse as Janet Achurch
TV ★ 7.0
1974
Playhouse as Alicia Moore
TV ★ 7.0
1972
Under Milk Wood as Mrs. Ogmore-Pritchard
Movie ★ 6.1
1971
Murphy's War as Hayden
Movie ★ 6.2
1971
Platonov as Anna
Movie ★ 8.0
1960s 18 credits
1969
Goodbye, Mr. Chips as Ursula Mossbank
Movie ★ 6.7
1969
Laughter in the Dark as Lady Pamela More
Movie ★ 4.3
1969
TV ★ 7.0
1969
W. Somerset Maugham as Martha Jones
TV
1968
Thief as Woman
Movie ★ 10.0
1967
ITV Playhouse as May Bartram
TV ★ 7.0
1967
TV ★ 7.5
1966
Eh, Joe? as Voice
Movie ★ 10.0
1965
Movie ★ 6.4
1965
BBC Play of the Month as Anna Voinitseva
TV ★ 5.3
1965
BBC Play of the Month as The Duchesse of Berwich
TV ★ 5.3
1965
BBC Play of the Month as Hesione Hushabye
TV ★ 5.3
1964
Becket as Gwendolen
Movie ★ 7.2
1963
Espionage as Anna
TV ★ 10.0
1962
Don Juan in Hell as Dona Ana
Movie
1962
The Longest Day as WRNS Officer (uncredited)
Movie ★ 7.6
1961
Drama 61-67 as Carole Blair
TV
1950s 3 credits
1956
TV ★ 6.0
1956
Tony Awards as Self - Nominee
TV
1951
TV ★ 8.8
s 1 credit