42x19: Nazi Attack on America
42x18: Invisible Universe Revealed
42x17: The Great Math Mystery
42x15: Petra: Lost City of Stone
42x14: Colosseum: Roman Death Trap
42x13: Sinkholes—Buried Alive
42x12: Sunken Ship Rescue
42x11: Big Bang Machine
42x10: First Man on the Moon
42x09: Killer Landslides
42x08: Emperor's Ghost Army
42x07: Bigger Than T. Rex
42x06: First Air War
42x05: Ben Franklin's Balloons
42x04: Surviving Ebola
42x03: Why Planes Vanish
42x02: Rise of the Hackers
42x01: Vaccines—Calling the Shots
41x22: D-Day's Sunken Secrets
41x21: Escape from Nazi Alcatraz
