Question: Caitlin Clarke was an American theater and film actress, best known for her role as Valerian in which 1981 American fantasy film, directed by Matthew Robbins? 

Context paragraphs:
Dragonslayer: Dragonslayer is a 1981 American fantasy film directed by Matthew Robbins, from a screenplay he co-wrote with Hal Barwood.  It stars Peter MacNicol, Ralph Richardson, John Hallam and Caitlin Clarke.  The story, set in a fictional medieval kingdom, follows a young wizard who experiences danger and opposition as he attempts to defeat a dragon.

Batteries Not Included: Batteries Not Included (stylized as *batteries not included) is a 1987 American family comic science fiction film directed by Matthew Robbins about small extraterrestrial living spaceships that save an apartment block under threat from property development.  The story was originally intended to be featured in the television series "Amazing Stories", but executive producer Steven Spielberg liked the idea so much that he decided to adapt it into a film.  It is also notable for being the feature film screenwriting debut of Brad Bird, who was one of the producers of the film.

Caitlin Clarke: Caitlin Clarke (May 3, 1952 – September 9, 2004) was an American theater and film actress best known for her role as Valerian in the 1981 fantasy film "Dragonslayer" and for her role as Charlotte Cardoza in the 1998–1999 Broadway musical "Titanic".

Modern Problems: Modern Problems is a 1981 American fantasy comedy film written and directed by Ken Shapiro and starring Chevy Chase, Patti D'Arbanville and Dabney Coleman.  The film grossed $26,154,211 in the United States.  A DVD release of the film was issued in 2005.

Florence Reed: Florence Reed (January 10, 1883 – November 21, 1967) was an American stage and film actress.  She is remembered for several outstanding stage productions, including "The Shanghai Gesture", "The Lullaby", "The Yellow Ticket" and "The Wanderer".  Her best remembered movie role was as Miss Havisham in the 1934 production of "Great Expectations".  In this version, however, Miss Havisham was changed from a completely insane woman to an eccentric, who did not wear her wedding veil constantly, and who dies peacefully rather than as a result of suffering burns in a fire.  In the 1950s Reed performed in several early television shows, such as "The Philco Television Playhouse", "Kraft Television Theatre" and "The United States Steel Hour". She is a member of the American Theater Hall of Fame.

Crimson Peak: Crimson Peak is a 2015 American gothic romance film directed, co-produced and co-written by Guillermo del Toro, co-produced by Callum Greene, Jon Jashni and Thomas Tull and co-written by Matthew Robbins.  It stars Mia Wasikowska, Tom Hiddleston, Jessica Chastain, Charlie Hunnam and Jim Beaver.

Matthew Robbins (screenwriter): Matthew Robbins (born 1945) is an American screenwriter and film director best known as for his work within the American New Wave movement.

The Legend of Billie Jean: The Legend of Billie Jean is a 1985 American drama film, directed by Matthew Robbins.

Don't Be Afraid of the Dark (2010 film): Don't Be Afraid of the Dark is a 2010 dark fantasy horror film written by Matthew Robbins and Guillermo del Toro and directed by comic book artist Troy Nixey.  An international co-production between the United States, Australia, and Mexico, it was filmed at the Drusilla Mansion in Mount Macedon, Victoria and Melbourne, Australia.  The film stars Katie Holmes, Guy Pearce, and Bailee Madison, as a family moving into a 19th-century Rhode Island mansion, where the withdrawn daughter (Madison) begins to witness malevolent creatures that emerge from a sealed ash pit in the basement of the house.  It is a remake of the 1973 ABC made-for-television horror film of the same name.

Ladyhawke (film): Ladyhawke is a 1985 American fantasy film directed by Richard Donner and starring Matthew Broderick, Rutger Hauer, and Michelle Pfeiffer.

Supporting paragraphs: Caitlin Clarke Dragonslayer
Answer: Dragonslayer