Yasen Peyankov

When a Russian dissident flees to the U.S. after contracting smallpox, McCord and retired U.N. Ambassador Kat Sandoval must work with Russian Foreign Minister Konstantin Avdonin to contain the outbreak.

As Elizabeth prepares to leave the state department and announce her run for president, terrorists attack the United Nations delegation in Geneva that is there to sign the climate migration treaty.

Elizabeth gets shocking news about a political operative and learns President Dalton may be considering replacing her with a new Secretary of State; Stevie and Jareth get engaged.

President Dalton's mental status is questioned when he threatens Russia over its potential role in a sonic attack at the U.S. embassy in Bulgaria.

When the eruption of an Icelandic volcano strands Elizabeth at an airport in Ireland with the Turkish foreign minister, she tries to broker a deal with him to save the lives of thousands of Syrian refugees; Henry gives Alison advice.

Elizabeth and Jay work to keep an historic agreement between Serbia and Kosovo from falling apart; Henry deals with a bizarre encounter with Secretary of Defense Gordon Becker.