Tonight on Madam Secretary: “Tamerlane”

A new episode of Madam Secretary titled “Tamerlane” airs tonight on CBS, and in it, Elizabeth secretly travels to Iran in an attempt to prevent a coup that could impact President Dalton’s administration.

In addition to that, Elizabeth brings her staff up to speed on the investigation into Marsh’s death.Anna Deveare Smith (Nurse Jackie, The West Wing) guest stars as Attorney General Mary Campbell in the episode, which airs at 8PM ET. Below, find some preview photos:

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Tamerlane -- Elizabeth secretly travels to Iran in an attempt to prevent a coup that could impact President Dalton's administration. Also, she brings her staff up to speed on the investigation into Marsh's death, on MADAM SECRETARY, Sunday, March 15 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Elizabeth McCord (Téa Leoni), shown. Photo: CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

Madam Secretary stars Téa Leoni (Elizabeth McCord), Tim Daly (Henry McCord), Bebe Neuwirth (Nadine Tolliver), Zeljko Ivanek (Russell Jackson), Patina Miller (Daisy Grant), Erich Bergen (Blake Moran), Geoffrey Arend (Matt Mahoney), Kathrine Herzer (Alison McCord), Evan Roe (Jason McCord), and Wallis Currie-Wood (Stephanie “Stevie” McCord).

Guest stars in “Tamerlane” include Patrick Breen (Andrew Munsey), Keith Carradine (President Conrad Dalton), Sebastian Arcelus (Jay Whitman), Nilaja Sun (Juliet), Dion Graham (Fred Cole), Usman Ally (Zahed Javani), Johanna Day (Admiral Ellen Hill), Anna Deveare Smith (Attorney General Mary Perlowski), Mike Pniewski (Gordon Becker), A George (Marajel Javani), Aiden Eyrick (Abdol Javani), Jaiya Chetram (Katan Javani), Frank C. Williams (Ds Agent John Kendall), Nathan Hinton (Fbi Agent 1), Ahmed Lucan (Iranian Guard), Nasser Faris (Jafar Alinejad), Nikiya Mathis (Marcia), Paolo Montalban (Military Teck), Houshang Touzie (President Najid Shiraz), and Nambi E. Kelley (Mrs. Cole).