Name	Known for
Anjelica Huston Vivianne Vivianne See fewer	The Grifters (1990)
Julianna Margulies Morgaine Morgaine See fewer	ER (1994)
Joan Allen Morgause Morgause See fewer	Room (I) (2015)
Samantha Mathis Gwenwyfar Gwenwyfar See fewer	Broken Arrow (1996)
Caroline Goodall Igraine Igraine See fewer	Disclosure (1994)
Edward Atterton Arthur Arthur See fewer	The Man in the Iron Mask (I) (1998)
Michael Vartan Lancelot Lancelot See fewer	Alias (2001)
Michael Byrne Merlin Merlin See fewer	Indiana Jones and the Last Crusade (1989)
Hans Matheson Mordred Mordred See fewer	Sherlock Holmes (2009)
Mark Lewis Jones Uther Uther See fewer	Gangs of London (2020)
Clive Russell Gorlois Gorlois See fewer	Sherlock Holmes (2009)
Tamsin Egerton Young Morgaine Young Morgaine See fewer	The Brothers Grimsby (2016)
Christopher Fulford Lot Lot See fewer	Scoop (2006)
David Calder Uriens Uriens See fewer	The World Is Not Enough (1999)
Hugh Ross Bishop Patricius Bishop Patricius See fewer	Nightbreed (1990)
Edward Jewesbury Ambrosius Ambrosius See fewer	Richard III (1995)
Freddie Highmore Young Arthur Young Arthur See fewer	Finding Neverland (2004)
Ian Duncan Accolon Accolon See fewer	Creep (I) (2004)
Noah Huntley Gawain Gawain See fewer	Snow White and the Huntsman (2012)
Honza Klima Kay Kay See fewer	The Peacemaker (1997)
John Comer Talbot Talbot See fewer	EuroTrip (2004)
Karel Dobrý Rhiannon Rhiannon See fewer	Mission: Impossible (1996)
Klára Issová Raven (as Klara Issova) Raven (as Klara Issova) See fewer	The Chronicles of Narnia: Prince Caspian (2008)
Biddy Hodson Elaine Elaine See fewer	Hellboy (2004)
Tony Curran Uther's Captain Uther's Captain See fewer	Calibre (2018)
Philip Lenkowsky Cuthbert Cuthbert See fewer	A Knight's Tale (2001)
Lucy Fillery Serving Woman (as Lucy Fillary) Serving Woman (as Lucy Fillary) See fewer	Dark Blue World (2001)
Elias Bauer Young Mordred (as Elias Zerael Bauer) Young Mordred (as Elias Zerael Bauer) See fewer	The Illusionist (2006)
Justin Muller Gareth Gareth See fewer	Passengers (I) (2016)
Gabriela Zajickova Child Child See fewer	The Mists of Avalon (2001)