After twenty years spent "chillin', tokin' and bonin'", Ali G is shocked to discover that his long-term girlfriend, Julie, is 8 months pregnant. Faced with an extra mouth to feed, he gets off his batty and heads to America to reclaim his former glory… but soon encounters adversaries who will ultimately threaten his and his child's very existence.

Ali G unwittingly becomes a pawn in the evil Chancellor's plot to overthrow the Prime Minister of Great Britain. However, instead of bringing the Prime Minister down, Ali is embraced by the nation as the voice of youth and 'realness', making the Prime Minister and his government more popular than ever.

Kazakh journalist Borat Sagdiyev travels to America to make a documentary. As he zigzags across the nation, Borat meets real people in real situations with hysterical consequences. His backwards behavior generates strong reactions around him exposing prejudices and hypocrisies in American culture.