Season 1:  (1967)

01. Beachhead

02. The Experiment

03. The Mutation

04. The Leeches

05. Genesis

06. Vikor

07. Nightmare

08. Doomsday Minus One

09. Quantity: Unknown

10. The Innocent

11. The Ivy Curtain

12. The Betrayed

13. Storm

14. Panic

15. Moonshot

16. Wall of Crystal

17. The Condemned

Season 2:  (1967-68)

18. Condition: Red

19. The Saucer

20. The Watchers

21. Valley of the Shadow

22. The Enemy

23. The Trial

24. The Spores

25. Dark Outpost

26. Summit Meeting – Part 1

27. Summit Meeting – Part 2

28. The Prophet

29. Labyrinth

30. The Captive

31. The Believers

32. The Ransom

33. Task Force

34. The Possessed

35. Counterattack

36. The Pit

37. The Organization

38. The Peacemaker

39. The Vise

40. The Miracle

41. The Life Seekers

42. The Pursued

43. Inquisition