Question: What was the film debut for the actress starring in the cult science fiction film written and directed by Joe Cornish?

Context articles: Attack the Block
Will Smith filmography
Don Henderson
James Cameron filmography
Con Man (web series)
Jodie Whittaker
Pamela Duncan (actress)
Stanley Sheff
Cliff Potts
Metalstorm: The Destruction of Jared-Syn

Attack the Block is a 2011 British science fiction horror comedy film written and directed by Joe Cornish and starring John Boyega, Nick Frost, Jodie Whittaker and Luke Treadaway.
 It was the film debut of Cornish, Boyega and future Academy Award-winning composer Steven Price.
Will Smith is an American actor and producer.
 His breakthrough came when he played a fictionalised version of himself in the 1990s television sitcom "The Fresh Prince of Bel-Air".
 The role brought him international recognition and two Golden Globe Award nominations for Best Actor – Television Series Musical or Comedy.
 He also served as an executive producer on 24 episodes of the series.
 Two years later, Smith made his film debut in the drama "Where the Day Takes You", where he appeared as a disabled homeless man.
 In 1995, he starred as a police officer with Martin Lawrence in Michael Bay's "Bad Boys".
 The following year, Smith appeared as a Marine Corps pilot with Jeff Goldblum in Roland Emmerich's science fiction film "Independence Day".
 The film grossed over $817 million at the worldwide box office and was the highest grossing of 1996.
 In 1997, he starred as Agent J in the science fiction film "Men in Black", a role he reprised in its sequels "Men in Black II" (2002), and "Men in Black 3" (2012).
Donald Francis Henderson (10 November 1931 – 22 June 1997) was an English actor of stage, television and screen.
 Henderson was known for playing both "tough guy" roles and authority figures, and is remembered for his portrayal of detective George Bulman between 1976 and 1987 in the popular Granada Television police drama series "The XYY Man", "Strangers", and "Bulman", as priest Frank Kane in BBC drama "The Paradise Club" (1989–90), and as General Tagge in the first "Star Wars" film (1977).
 This last role also brought him attention from science fiction fans, and he later appeared in cult science fiction television series "Red Dwarf" and "Doctor Who".
James Cameron is a Canadian director, screenwriter, and producer who has had an extensive career in film and television.
 Cameron's debut was the 1978 science fiction short "Xenogenesis", which he directed, wrote and produced.
 In the early part of his career, he did various technical jobs such as special visual effects producer, set dresser assistant, matte artist, and photographer.
 His feature directorial debut was the 1981 release "".
 The next film he directed was the science fiction action thriller "The Terminator" (1984).
 It starred Arnold Schwarzenegger as the titular cyborg assassin, and was Cameron's breakthrough feature.
 In 1986, he directed and wrote the science fiction action sequel "Aliens" starring Sigourney Weaver.
 He followed this by directing another science fiction film "The Abyss" (1989).
 In 1991, Cameron directed the sequel to "The Terminator", "" (with Schwarzenegger reprising his role), and also executive produced the action crime film "Point Break".
 Three years later he directed a third Schwarzenegger-starring action film "True Lies" (1994).
Con Man is an American comedy web series created, written, directed by, and starring Alan Tudyk.
 The series follows cult science fiction actor Wray Nerely (Tudyk), as he tours the convention circuit.
 Tudyk, one of the stars of the 2002 science fiction TV show "Firefly", based "Con Man" loosely upon his own experiences.
 The series is co-produced by PJ Haarsma and by Nathan Fillion, who also co-stars in it.
 Crowdfunded through Indiegogo, "Con Man" set records for crowdfunding a web series by raising more than $1 million in 24 hours and more than $3.1 million overall.
Jodie Auckland Whittaker (born 3 June 1982) is an English actress.
 She came to prominence in her 2006 feature film debut "Venus", for which she received British Independent Film Award and Satellite Award nominations.
 She was later praised for her roles in the cult science fiction film "Attack the Block", the "Black Mirror" episode "The Entire History of You", and as grieving mother Beth Latimer in "Broadchurch".
Pamela Duncan (December 28, 1924 – November 11, 2005) was an American B-movie actress who starred in the 1957 Roger Corman cult science fiction film "Attack of the Crab Monsters" and later appeared in the 2000 Academy Award-nominated documentary, "Curtain Call", that focused on the lives and careers of the residents of the Lillian Booth Actors Home in Englewood, New Jersey.
Stanley Sheff is a Hollywood born director and writer.
 He has worked in television, stage and screen.
 His collaboration with Orson Welles eventually led Sheff to direct and co-write the cult science fiction feature "Lobster Man From Mars" starring Tony Curtis, based on a title suggested by Welles.
 Feature films and television are not the only types of projects directed by Stanley Sheff.
 In the early 1980s he produced, directed and performed a popular comedy radio show for KROQ-FM radio in Los Angeles called "The Young Marquis And Stanley", a comedy show that was aired on Sunday evenings.
 He has appeared as Master of Ceremonies on stage and at live vintage dance events as his character Maxwell DeMille.
Cliff Potts (born January 5, 1942) is an American television and film actor most noted for his role as John Wolf in the 1972 cult science fiction film, "Silent Running" starring Bruce Dern.
Metalstorm: The Destruction of Jared-Syn is a 1983 cult science fiction film starring Jeffrey Byron, Michael Preston, Tim Thomerson, Kelly Preston and Richard Moll.
 It was directed and produced by Charles Band who is possibly better known for his other, rather low-budget science fiction and horror films such as the "Puppet Master" and "Trancers" series.
 The story is a space-age western which combines themes of esoteric sorcery and high technology.
 "Metalstorm" was filmed in 3D.