Hillary Clinton will join fellow former US Secretaries of State Colin Powell and Madeleine Albright on the debut episode of the new season of political drama Madam Secretary when it returns this October.

The CBS show, which stars Tea Leoni as Elizabeth McCord - a former CIA analyst and political science professor turned Secretary of State - returns for its fifth season in October.

The Hollywood Reporter says that Clinton, Powell and Albright will appear as themselves in the opening episode, which is set to air Sunday, October 7 in the US.

The three political powerbrokers filmed their cameos on July 11. In the first episode of the new season, McCord asks Albright, Powell and Clinton for advice on a delicate matter.

Madam Secretary creator and executive producer Barbara Hall said, "We’re delighted to have these three former Secretaries of State be part of our season premiere.

"It was a privilege to experience their perspectives and discourse both in and behind the scenes."

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