Synopsis by Hal Erickson
A congressional witness against crime boss Lou Cranek (Dan Seymour) suddenly refuses to testify--then abruptly drops dead. The reason? The unfortunate witness has fallen victim to a deadly mind-controlling machine, created for the "good of mankind" by kindly Dr. Stanton (Griff Barnett), but used instead for evil purposes by Cranek and his gang. Superman (George Reeves) must locate and destroy the machine before the next witness, Lois Lane (Phyllis Coates), comes to harm as well. This episode marks the first appearance of familiar Superman bad guy Ben Welden (he's the guy with the bald head and the toothy grin).