The Phantom From 10,000 Leagues, per the DVD case, is about "The U.S. Government sends a scientist to investigate some mysterious deaths along a stretch of beach on the pacific Coast. What brings the scientist into the investigation is the radiation burns found on the victims. Arriving at the scene of the deaths, the scientist visits the nearby Pacific College of Oceanography where he meets Professor King and his daughter Lois. While falling for the professor's daughter, our scientist begins to suspect that Professor King's secret research is somehow connected to the radiation and the deaths."
You can now watch this feature film through the Internet Archive! Hurray Internets!