Self - Narrator (12 episodes, 2012)
Self - Military Expert & Former Navy Seal (12 episodes, 2012)
Self - Editor-in-Chief, Popular Mechanics (12 episodes, 2012)
Self - National Museum of Civil War Medicine (9 episodes, 2012)
Self - Military Historian (9 episodes, 2012)
Self - NBC Nightly News (8 episodes, 2012)
Self - Harvard University (7 episodes, 2012)
Self - New York Presbyterian Hospital (7 episodes, 2012)
Self - Writer (6 episodes, 2012)
Self - China Institute & UNESCO (5 episodes, 2012)
Self - Writer (5 episodes, 2012)
Self - Chef & Writer (4 episodes, 2012)
Self - Stony Brook University (4 episodes, 2012)
Self - University of California, Los Angeles (4 episodes, 2012)
Self - University of Maryland (4 episodes, 2012)
Self - University of British Columbia (4 episodes, 2012)
Self - Writer (4 episodes, 2012)
Self - St. Norbert College (4 episodes, 2012)
Self - Stanford University (4 episodes, 2012)
Self - University of Southern Maine (3 episodes, 2012)
Self - Writer (3 episodes, 2012)
Self - University of Texas (3 episodes, 2012)
Self - Stanford University (3 episodes, 2012)
Self - U.S. Marine Corps (3 episodes, 2012)
Self - Native American Cultural Center, Yale University (2 episodes, 2012)
Self - Cornell College (2 episodes, 2012)
Self - Writer (2 episodes, 2012)
Self - Crossexamined.org (2 episodes, 2012)
Self - Editor-in-Chief, MAKE (2 episodes, 2012)
Self - U.S. Centers for Disease Control and Prevention (2 episodes, 2012)
Self - Princeton University (2 episodes, 2012)
Viking Chief / Viking Leader 2012 (2 episodes, 2012)
Self - Writer (1 episode, 2012)
Self - Columbia University Medical Center (1 episode, 2012)
Benjamin Latrobe Jr. (1 episode, 2012)
Hernán Cortés (1 episode, 2012)
Capt. Robert A. Lewis (1 episode, 2012)
Jim Clark (1 episode, 2012)
William Parsons (1 episode, 2012)
King Genseric (1 episode, 2012)
Amor (1 episode, 2012)
Theodoor de Mulder (1 episode, 2012)
Refine Sims (1 episode, 2012)
Father of Mankind (1 episode, 2012)
Richard Arkwright (1 episode, 2012)
Titanic 2nd Deck Officer (1 episode, 2012)
Leopold von Gilsa (1 episode, 2012)
Viking (1 episode, 2012)
Ice Age Man (1 episode, 2012)
Saint Paul (1 episode, 2012)
Samoset (1 episode, 2012)
Christopher columbus (1 episode, 2012)
Ice Matriarch (1 episode, 2012)
Aztec Warrior (1 episode, 2012)
Peggy Jordaan (1 episode, 2012)
Tancred De Hautville (1 episode, 2012)
Spanish Captain (1 episode, 2012)
Empress of Roma (1 episode, 2012)
Viking Sacrifice Girl (1 episode, 2012)
Farmer Roswell Garst (1 episode, 2012)
Venetian Thief (1 episode, 2012)
Dene Friedman (1 episode, 2012)
Jesus of Nazareth (1 episode, 2012)
Alice Harris (1 episode, 2012)
Spartan King Pausanius (1 episode, 2012)
Louis Washkanski (1 episode, 2012)
Roman Slave 2012 (1 episode, 2012)
Jewish Prince (1 episode, 2012)
Shah Jahan (1 episode, 2012)
Dr. Christiaan Barnard (uncredited) (1 episode, 2012)
Roman Woman (uncredited) (1 episode, 2012)