A group of saboteurs who are trying to undermine the government kidnap several prominent scientists, including the father of a local street gang member. The gang team up with the FBI and the “Junior G-Men” in order to stop the saboteurs.
Crime | Drama
| Billy Halop | … | Billy Barton | |
| Huntz Hall | … | Gyp | |
| Gabriel Dell | … | Terry | |
| Bernard Punsly | … | Lug | |
| Ken Lundy | … | Buck | |
| Kenneth Howell | … | Harry Trent | |
| Roger Daniels | … | Midge (as Roger Daniel) | |
| Phillip Terry | … | Jim Bradford |
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Junior G-Men: Chapter 1 – Enemies Within
Junior G-Men: Chapter 2 – The Blast of Doom
Junior G-Men: Chapter 3 – Human Dynamite
Junior G-Men: Chapter 4 – Blazing Danger
Junior G-Men: Chapter 5 – Trapped by Traitors
Junior G-Men: Chapter 6 – Traitors’ Treachery
Junior G-Men: Chapter 7 – Flaming Death
Junior G-Men: Chapter 8 – Hurled Through Space
Junior G-Men: Chapter 9 – The Plunge of Peril
Junior G-Men: Chapter 10 – The Toll of Treason
Junior G-Men: Chapter 11 – Descending Doom
Junior G-Men: Chapter 12 – The Power of Patriotism