"The Wicked Warlock" was a made-for-TV villain who had more than his fair share of run-ins with Superman in the 60's. This episode is his first appearance. Warlock would later be part of a group with more established rogues Lex Luthor, Prankster, & Toyman in 2 adventures, but despite his being supernatural in nature, he came across as being, well, lame.
Edit, 1/21/19: The video has been deleted. If/when it returns, we'll bring it back.
Amazingly, Mort Weisinger, a DC editor who served as a consultant to the series, never considered using Warlock in the books. I wonder why.......