The Grayson SubmarineAdventures of...
The Grayson Submarine
Adventures of Superman Radio Serial - May 1941
Jimmy, Clark, Perry and Lois all find themselves embroiled in the U.S. government’s attempts to protect inventor Charles Grayson’s groundbreaking new submarine from the destructive hands of enemy agents, personified in the mysterious Dr.Deutch (The counterintuitive spelling of his name actually plays a role in the next story arc).
The series’ second recurring villain - depending if you count Keno and The Wolf altogether as part of The Yellow Mask’s entourage - Mr.Deutch personifies an increasing presence of “foreign agents” in these pre-war adventures.