Assault on Agathon

Assault on Agathon is a 1975 drama film directed by László Benedek and starring Nico Minardos, Nina van Pallandt, Marianne Faithfull and John Woodvine. It is based on a novel by Alan Caillou.
Premise.
Cabot Cain is a Western secret agent assigned to stop the mysterious Agathon, an ex-World War II revolutionary, who is committing terrorist acts in Greece and Albania.
Production.
Nico Minardos obtained financing for the film from Kjell Qvale, a Bay Area-based automotive entrepreneur who was then the majority shareholder in Jensen Motors. Minardos had approached Qvale for a product placement deal to use a Jensen Interceptor during filming but ultimately convinced Qvale to finance the entire movie.