S42 E1: Vaccines Calling the Shots

S42 E2: Rise of the Hackers

S42 E3: Why Planes Vanish

S42 E4: Surviving Ebola

S42 E5: Ben Franklin's Balloons

S42 E6: First Air War

S42 E7: Bigger Than T. rex

S42 E8: Emperor’s Ghost Army

S42 E9: Killer Landslides

S42 E10: First Man on the Moon

S42 E11: Big Bang Machine

S42 E12: Sunken Ship Rescue

S42 E13: Sinkholes—Buried Alive

S42 E14: Colosseum: Roman Death Trap

S42 E15: Petra: Lost City of Stone

S42 E16: Hagia Sophia: Istanbul’s Ancient Mystery

S42 E17: The Great Math Mystery

S42 E18: Invisible Universe Revealed

S42 E19: Nazi Attack on America

S42 E20: Lethal Seas

S42 E21: Chasing Pluto

S42 E22: Nuclear Meltdown Disaster