One year after the murder of columnist Jamal Khashoggi, a two-hour FRONTLINE documentary investigates the rise and rule of Crown Prince Mohammed bin Salman of Saudi Arabia (MBS). Correspondent Martin Smith, who has covered the Middle East for FRONTLINE for 20 years, examines the crown prince’s vision for the future, his handling of dissent, his relationship with the United States — and his ties to Khashoggi’s killing.

Bitter Rivals illuminates the essential history - and profound ripple effect - of Iran and Saudi Arabia's power struggle. It draws on scores of interviews with political, religious and military leaders, militia commanders, diplomats, and policy experts, painting American television's most comprehensive picture of a feud that has reshaped the Middle East.

A detailed investigation into the political and economic interests that, since the beginning of the 20th century, have pulled the strings of the arms trade, hidden in the shadows, feeding the shameful corruption of politicians and government officials and promoting a state of permanent war throughout the world, while they cynically asked for a lasting and universal peace.