Question: What English film, theatre and television actor appear in Harlequin, a 1980 Australian thriller?

Context paragraphs:
1980 Australian Film Institute Awards: The 1980 Australian Film Awards ceremony, presented by the Australian Film Institute (AFI), honoured the best Australian feature films of 1980, and took place on 17 September 1980 at Regent Theatre, in Sydney, New South Wales.  The ceremony was hosted by Graham Kennedy and televised in Australia on ABC.

Hoodwink (1981 film): Hoodwink is a 1981 Australian thriller film directed by Claude Whatham and written by Ken Quinnell.  It stars John Hargreaves and Judy Davis.  The film is based on the true story of a well-publicized Australian con artist.  It was nominated for eight Australian Film Institute Awards, with Davis winning the Award for Best Actress in a Supporting Role.

Harlequin (film): Harlequin (known as Dark Forces in US) is a 1980 Australian thriller film directed by Simon Wincer and starring Robert Powell, Carmen Duncan, David Hemmings and Broderick Crawford.  The film is a modern-day version of Rasputin's story: the major characters have the same first names as Rasputin and the Romanov royal family; and their family name, 'Rast', is simply the word 'Tsar' backwards.

Cut Snake: Cut Snake is a 2014 Australian thriller film directed by Tony Ayres.  The title comes from the Australian idiom "mad as a cut snake" which describes either insanity or anger so extreme you don’t want to get near it.  The film was screened in the Contemporary World Cinema section at the 2014 Toronto International Film Festival.

The Chain Reaction: The Chain Reaction is a 1980 Australian independent disaster/science fiction thriller film directed and written by Ian Barry.  The film stars Steve Bisley and Arna-Maria Winchester.  The film's plot is about an engineer badly injured in an accident caused by an earthquake.  He knows that the nuclear waste will poison the groundwater and wants to warn the public.

David Hemmings: David Edward Leslie Hemmings (18 November 1941 – 3 December 2003) was an English film, theatre and television actor, as well as a film and television director and producer.  He founded also the Hemdale Film Corporation in 1967.

Departmental: Departmental is a 1980 Australian TV movie based on a play by Mervyn Rutherford.  It was part of the ABC's Australian Theatre Festival.  Reviews were poor.

Final Cut (1980 film): Final Cut is a 1980 Australian thriller film directed by Ross Dimsey.  It was the first movie funded by the Queensland Film Corporation, who provided half the budget.  The Australian Film Commission and private investment provided the rest of the finance.  It was originally envisioned as a tele movie but then developed into a feature.

Fortress (1985 film): Fortress is a 1985 Australian thriller television film directed by Arch Nicholson and written by Everett De Roche, and starring Rachel Ward, based on Gabrielle Lord's 1980 novel the "Fortress".

Stir (film): Stir is a 1980 Australian film directed by Stephen Wallace in his feature directorial debut.  The prison film was written by Bob Jewson, based upon his own experience while incarcerated as the actual prison riot at Bathurst Correctional Complex in 1974 and its subsequent Royal Commission into New South Wales Prisons.  The film was shot in Clare Valley, Gladstone and the Flinders Ranges in South Australia.  It premiered at the 1980 Cannes Film Festival.

Supporting paragraphs: Harlequin (film) David Hemmings
Answer: David Hemmings