Sunday is Monkey Covers day here at YACB. Because there's nothing better than a comic with a monkey on the cover.
Dr. Nagan gets his comeuppance on Larry Lieber & Vince Colletta's 1974 cover to Weird Wonder Tales #7.
(Standard disclaimer about pissed-off gorillas not really being monkeys applies.)
Image courtesy of the GCD. Click on the image for a larger version.