Season 12

1. Poison

2. Car Tech of the Future

3. The Arch

4. More Nature's Engineers

5. World's Biggest Machines 3

6. Blackbird Stealth

7. The Butcher

8. George Washington Carver Tech

9. Firefighting!: Extreme Conditions

10. Desert Tech

11. Sub Zero

12. The Great Bridge: 8 Miles of Steel

13. Howard Hughes Tech

14. Edwards Air Force Base

15. Taxidermy

16. SWAT

17. Deadliest Weapons

18. The Doomsday Clock

19. The Basement

20. Paint

21. Mega Movers

22. Punishment

23. Bricks

24. Glue

25. F/A-22 Raptor

26. Civil War Tech

27. Machines of D-Day

28. John Hancock Center

29. The Cape Cod Canal

30. Secret Japanese Aircraft of World War II

31. Future Tech

32. Edison Tech

33. Secrets of Soviet Space Disasters

34. Mountain Roads

35. Route 66

36. Cowboy Tech

37. Sewers

38. Challenger Tank

39. World's Biggest Machines 4

40. Dredging

41. Lube Job

42. Secret Luftwaffe Aircraft of World War II

43. The World's Fastest

44. The B-2 Stealth Bomber

45. High Risk: Helicopter Lineman

46. Wiring America

47. Nature Tech: Lightning

48. HMS Victory

49. Engineering an Empire: Rome

50. Coffee

51. Sugar

52. Cereal: History in a Bowl

53. F-117 Nighthawk Stealth

54. German Small Arms of World War II

55. The Auto Store

56. Secret Allied Aircraft of World War II

57. Engineering Disasters 17

58. Brewing

59. The Lumberyard

60. Da Vinci Tech

61. Custom Cars

62. More Hardware

63. Weird Weapons: The Allies

64. More Snack Food Tech

65. Walt Disney World

66. Nature Tech: Hurricanes

70. Private Collections