Agent 3S3: Massacre in the Sun

{{Infobox film

| name = Agent 3S3: Massacre in the Sun

| image = Agent 3S3, Massacre in the Sun.jpg

| caption =

| director = Sergio Sollima

| producer =

| writer =

| starring =

| music =Piero Umiliani

| cinematography = {{ill|Carlo Carlini|it|Carlo Carlini}}

| editing = Bruno Mattei

| distributor =

| released = {{Film date|1966}}

| runtime =

| country = Italy

| language = Italian

| budget =

}}

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 Agent 3S3: Passport to Hell (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".{{cite book|last=Francesco Adinolfi, Karen Pinkus|title=Mondo exotica|publisher=Duke University Press, 2008}}{{cite book|last=Marco Giusti|title=007 all'italiana|publisher=Isbn Edizioni, 2010}} The two films were shot back to back.

This was filmed on locations in Berlin and Ibiza.{{cite web|last=Fabio Zanello |title=La regia come match di boxe – Intervista a Sergio Sollima |url=http://www.sentieriselvaggi.it/articolo.asp?sez0=6&sez1=0&art=7993 |publisher=Sentieri Selvaggi |accessdate=16 January 2012 |date=4 August 2004 |url-status=dead |archiveurl=https://web.archive.org/web/20130925095136/http://www.sentieriselvaggi.it/articolo.asp?sez0=6&sez1=0&art=7993 |archivedate=25 September 2013 }} 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.