- Adventure
- Mystery

Secret Agent K-7 Returns
66 episodes Aired 1939
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1. Border Violations
   15mins Aired 1939
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2. Poisonous Gas
   15mins Aired 1939
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3. Information Peddler
   15mins Aired 1939
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4. Narcotics Peddlers
   15mins Aired 1939
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5. Sabotage in Industry
   15mins Aired 1939
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6. Fortified Borders
   15mins Aired 1939
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7. Blood and Steel Society
   15mins Aired 1939
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8. Illegal Use of Radio
   15mins Aired 1939
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9. Coast Defense Secrets
   15mins Aired 1939
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10. Suicide Ships
    15mins Aired 1939
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11. War Supplies
    15mins Aired 1939
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12. Revolution
    15mins Aired 1939
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13. Military Secrets Leaked
    15mins Aired 1939
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14. Undesirable Aliens
    15mins Aired 1939
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15. High Speed Bomber
    15mins Aired 1939
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16. Master Spy
    15mins Aired 1939
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17. Gold Shipments
    15mins Aired 1939
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18. Storm Cloud
    15mins Aired 1939
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19. Apparent Civil War
    15mins Aired 1939
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20. Air Defenses
    15mins Aired 1939
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21. Thermite Bombs
    15mins Aired 1939
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22. Fleet Movements
    15mins Aired 1939
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23. Foodstuffs
    15mins Aired 1939
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24. Secret Police
    15mins Aired 1939
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25. Aeroplane Order
    15mins Aired 1939
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26. Innocent Citizens Used
    14mins Aired 1939
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27. Bombing Planes
    15mins Aired 1939
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28. Embassy Master Spy
    14mins Aired 1939
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29. Shipyards
    15mins Aired 1939
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30. Colonial Uprising
    15mins Aired 1939
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31. World Crisis
    15mins Aired 1939
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32. Government Overthrow
    15mins Aired 1939
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33. Refugees
    14mins Aired 1939
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34. Fraudulent Passports
    15mins Aired 1939
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35. Information for the Premier
    15mins Aired 1939
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36. Secrets Leaked
    15mins Aired 1939
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37. Code Book Stolen
    14mins Aired 1939
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38. Known Spy
    15mins Aired 1939
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39. Inventor Missing
    15mins Aired 1939
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40. Wholesale Murder
    15mins Aired 1939
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41. Anti-Aircraft Gun
    14mins Aired 1939
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42. Agent Z Disappears
    14mins Aired 1939
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43. Counterfeiters
    15mins Aired 1939
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44. Vapor Gas
    15mins Aired 1939
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45. Aeroplane Factory
    15mins Aired 1939
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46. Defense Plans
    15mins Aired 1939
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47. Ultimatum
    15mins Aired 1939
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48. City of Intrigue
    15mins Aired 1939
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49. Firing Squad
    15mins Aired 1939
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50. Narcotics Smuggled
    15mins Aired 1939
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51. Aeroplane Plans
    15mins Aired 1939
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52. Delivery of Papers
    15mins Aired 1939
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53. Government Overthrow
    15mins Aired 1939
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54. Agent Missing
    15mins Aired 1939
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55. Military Information Stolen
    15mins Aired 1939
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56. Oriental Spy 1
    15mins Aired 1939
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57. Oriental Spy 2
    15mins Aired 1939
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58. Favor Returned
    15mins Aired 1939
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59. Foreign Agent
    15mins Aired 1939
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60. Letter Box Agent
    15mins Aired 1939
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61. Military and Diplomatic Secrets
    15mins Aired 1939
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62. Blonde Spy
    15mins Aired 1939
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63. Defense Programs
    15mins Aired 1939
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64. Spy Returns
    15mins Aired 1939
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65. Stolen Maps
    15mins Aired 1939
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66. Far East Mission
    15mins Aired 1939
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Secret Agent K-7 Returns is a syndicated radio series that first aired in 1939, featuring seventy-eight fifteen-minute episodes revolving around spy stories. The character of Secret Agent K-7 didn't participate in most of the adventures but rather introduced the stories of what other agents did. As the episodes progressed, K-7 took a more active role, assigning missions to the three main agents who starred in the program and occasionally assisting in capturing the antagonist. The series was well-paced and exciting, focusing on various plans to undermine world peace, including sabotage, blackmail, assassination, and border violations. The episodes had historical significance as they subtly warned America about the danger of Hitler and the start of World War II in Europe.

The Secret Agent K-7 Returns radio show featured a prolonged organ intro that allowed the local announcer to insert commercials for the local furniture store or dairy. Each episode lasted about 12 and a half minutes, with interesting and exciting cases. The actors who brought these spy stories to life remain unknown today, much like the real spies of the time. The sound quality of the episodes is excellent, and they offer valuable insight into America's history during that time. The show's organ music is enjoyable as a mark of old-time radio shows, and the sound effects provide the drama that modern audiobooks lack. The series' episodes continue to remain relevant, as they address issues that are still pertinent today, such as undesirable aliens, fraudulent passports, government overthrow, and world crisis.

Performers: Unknown

Sources: archive.org, otrcat.com