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.

Orietta Berti, a popular Italian singer, sings in English the film's theme "Trouble galore".

This was filmed on locations in Berlin and Ibiza.

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