The Clown is a villain from DC comics who has faced the Flash - as his name suggests he is an example of the evil clown stereotype common in fiction.
In the middle of their high-wire act, the Flying Corleys have been saved had the Flash been there, and he was scheduled to make a charity performance, but he had been called away on an emergency JLA case. The blackout itself would have been prevented if construction of Central City’s new power plant hadn’t been delayed.
Dr. Joar Mahkent was a scientist who invented a cold gun and used it to commit crimes. He clashed with the Green Lantern (Alan Scott) on a regular basis alone and the JSA as part of the Injustice Society of the World.
Lyle Corley, went on a crime spree to attract the Flash’s attention. He then kidnapped the governor, the mayor, and the head of Consolidated Power, lured the Flash out, and knocked him out with sub-sonics. Corley then prepared to recreate the accident, this time with the four men he blamed for the original. The Flash was able to break out of the death-trap and capture Corley.
After Zolomon tracked him down, he tore another family apart.