FRONTLINE investigates how a dangerous rivalry between Iran and Saudi Arabia has plunged the Middle East into sectarian war. Pictured at left is Iran's Supreme Leader Ayatollah Ali Khamenei; pictured at right is Saudi Crown Prince Mohammed bin Salman.

Bitter Rivals

Iran and Saudi Arabia

February 20 and February 27, 2018

Season 2018: Episode 17

Photo: REUTERS/Morteza Nikoubazl & Bandar Algaloud/Courtesy of Saudi Royal Court/Handout via REUTERS

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FRONTLINE investigates how a dangerous political rivalry between Iran and Saudi Arabia has plunged the Middle East into sectarian war.