Hanna-Barbera’s adventure cartoon line had a lot in common with Red Star Mystery magazine. A ways down in my blog is a full description of The Scarlet Wizard, wherein he sounds a lot like the Scooby-Doo gang.
Dr. Thaddeus Harker sounds much the same…
Doc Harker appeared in an eponymous pulp in 1940, and although his stories were interesting and on the better side they did not last. He was a tall, thin, older man who dressed in the style of an ante-bellum Kentucky colonel, complete with silver hair, mustache, and pointed goatee (Think “Colonel Sanders”). His profession was that of wandering salesman; he traveled around the country selling “Chickasha Remedies,” a cure-all for whatever ailed ya. While he was very good at selling the tonic, his real love was criminology. In his van, which doubled as a scientific laboratory and armed vehicle, he traveled with his two assistants, finding crimes wherever he went and solving them. Harker was not strong in the style of most heroes; he was the brains of the outfit. Brenda Sloan, a beautiful woman who lived in the van with Doc, did the legwork for him whenever they entered a new town. Herk Jones, a former wrestler, handled the heavy lifting.
It goes to prove that no idea is entirely new and the fact that the pulps had a profound influence on later forms of entertainment, if only to serve as a training ground for writers.