Agent 3S3: Massacre in the Sun  Agent 3S3: Massacre in the Sun (originally titled Agente 3S3, massacro al sole, also known as "Agent 3S3: Hunter from the Unknown" and "Hunter from the Unknown") is a 1966 Italian adventure-eurospy film directed by Sergio Sollima, here credited as Simon Sterling. This is a sequel to "" (1965) with Agent 3S3 once again played by George Ardisson. Orietta Berti, a popular Italian singer, sings in English the film's theme "Trouble galore". This was filmed on locations in Berlin and Ibiza. It was coproduced by France, where it was released as "Agent 3S3, massacre au soleil", and Spain, where is known as "3S3, agente especial" and "Agente 3S3 enviado especial".