Tristram Coffin (1909-1990) was a character actor who generally played gangsters. He appeared in various MSTied movies, and also played the titular character in the movie serial King of the Rocket Men. The costume of the main character of Rocket Men would later be used for the main character of Radar Men from the Moon, Commando Cody.
The Corpse Vanishes (Experiment #105) - as Dr. Foster
The Crawling Hand (Experiment #106) - as Chief Meidel