Davies' novels The Artificial Man (1965) and Psychogeist (1966) were adapted into the 1968 film Project X and The Alien (1968) was very freely adapted into the 1972 film The Groundstar Conspiracy, starring George Peppard and Michael Sarrazin.
For seven years (1967-1974) he was in a relationship with actress Jacqueline Bisset, whom he met while making the drama film The Sweet Ride (1968).
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The film stars Michael Sarrazin in the title role, along with rising stars Margot Kidder of Superman, Jennifer O'Neill, star of Summer of '42, and Cornelia Sharpe, best known for her part in Serpico.