A doctor working with the Bureau of Pure Foods and Drugs, uses radio broadcasts to expose fraudulent patent medicines.
Robert Livingston
as Dr. Lawrence Baxter
Grace Bradley
as Jean Sterling
Willard Robertson
as Inspector 'Mac' McDonald
Pierre Watkin
as Kennedy
Smiley Burnette
as Jimmy
Granville Bates
as Prof. Rexford Sterling
William Newell
as Andrews
Byron Foulger
as Pete Andorka
Wilbur Mack
as F. J. Thompson
Matty Fain
as Burke
Josephine Whittell
as Nurse Nelson
Charles Timblin
as Swain
