Question: Who starred in a 1983 science fiction fantasy film directed by Antonio Margheriti, who was Tall, thin and gaunt ?

Context paragraphs:
Yor, the Hunter from the Future: Yor, the Hunter From The Future, in (Italian: "Il mondo di Yor" , 'The World Of Yor' ) is a 1983 science fiction fantasy film directed by Antonio Margheriti and starring Reb Brown, Corinne Cléry, Luciano Pigozzi, and John Steiner.  The film was an Italian-French-Turkish co-production based on the Argentinian comic "Yor the Hunter."

Castle of Blood: Castle of Blood (Italian: "Danza Macabra" ) is a 1964 horror film directed by Antonio Margheriti and Sergio Corbucci.  The film stars Barbara Steele, Arturo Dominici and Georges Rivière.  The film was initially commissioned to director Sergio Corbucci who had Gianni Grimaldi and Bruno Corbucci set to write the film.  A scheduling conflict led to Corbucci's friend Margheriti being hired to complete the film.  To avoid going overtime, Corbucci was brought in to film one scene.

Antonio Margheriti: Antonio Margheriti (19 September 1930 – 4 November 2002), also known under the pseudonym Anthony M. Dawson, was an Italian filmmaker.  Margheriti worked in many different genres in the Italian film industry, and was known for his sometimes derivative but often stylish and entertaining science fiction, sword and sandal, horror/giallo, Eurospy, spaghetti western, Vietnam War and action movies that were released to a wide international audience.

War of the Planets (1966 film): War of the Planets (Italian: "I Diafanoidi Vengono da Marte" , literally "The Diaphanoids Come From Mars") is a 1965 Italian science fiction film, produced by Joseph Fryd and Antonio Margheriti, directed by Antonio Margheriti, that stars Tony Russel and Lisa Gastoni (Russel's name is misspelled in the opening credits as "Tony Russell").  It was released theatrically in Europe in 1966.  The film's story and screenplay were written by Ivan Reiner and Renato Moretti.

The Rip-Off: The Rip-Off (Italian: Controrapina ) is a 1980 film directed by Antonio Margheriti.  It was Margheriti's third collaboration with actor Lee Van Cleef, after previously directing him in "The Stranger and the Gunfighter" and "Take a Hard Ride".

The Day the Sky Exploded: The Day the Sky Exploded (Italian: "'La morte viene dallo spazio" , 'Death Comes From Space' ) is a 1958 science fiction film directed by Paolo Heusch.  It is known as the first Italian science fiction film, predating even the science fiction films of Antonio Margheriti.

Hercules, Prisoner of Evil: Hercules, Prisoner of Evil (Italian: "Ursus il terrore dei Kirghisi" , 'Ursus, Terror of the Kirghiz' ) is a 1964 Italian "peplum" film directed by Antonio Margheriti and an uncredited Ruggero Deodato.  Deodato, the official assistant director, replaced Margheriti as he was busy with the completion of the film "The Fall of Rome".  Deodato actually directed most of the film in actuality but Margheriti was credited as the director.  The film is filled with a variety of horrific themes and elements, featuring a killer werewolf, and is as much a horror film as it is a peplum.

John Steiner: John Steiner (born 7 January 1941 in Chester, Cheshire) is an English actor.  Tall, thin and gaunt, Steiner attended the Royal Academy of Dramatic Arts and worked for a few years at the BBC.  Steiner featured in a lead role in a television production of "Design for Living" by Noël Coward.  Later he found further work primarily in films including "Marat/Sade" (1967), and the original "Bedazzled" (1967) with Peter Cook and Dudley Moore.  In 1969, Steiner was hired to play a part in the spaghetti western "Tepepa", and also appeared opposite Franco Nero in "White Fang", directed by Lucio Fulci.  He found himself in demand in Italy and moved there, appearing in a great number of Italian exploitation and B-films including police actioners ("Violent Rome"), westerns ("Mannaja"), war films ("The Last Hunter"), nazisploitation ("Deported Women of the SS Special Section"), sci-fi adventure films ("Yor, the Hunter from the Future"), and horror films, such as Mario Bava's "Shock", Dario Argento's "Tenebrae", and Ruggero Deodato's "Body Count".  He also became a favourite of famed Italian filmmaker Tinto Brass, featuring in "Salon Kitty", the infamous "Caligula", "Action", and "Paprika".

Cannibal Apocalypse: Cannibal Apocalypse (Italian: "Apocalypse Domani" ) is a 1980 horror film directed by Antonio Margheriti.  The film combines the horror genre with a forerunner of Margheriti's Vietnam War films.

Space-Men: Space-Men (a.k.a. Assignment: Outer Space) is a 1960 Italian science fiction film directed by Antonio Margheriti.  The film stars Rik Van Nutter and co-stars Gabriella Farinon, David Montresor, Archie Savage, and Alain Dijon.

Supporting paragraphs: Yor, the Hunter from the Future John Steiner
Answer: John Steiner