Frankenstein versus Frankenstein zombies

I originally blogged this image in this 1 December 2013 post at Infernal Wonders, and found it at the tumblr Space Ghost Zombie, now defunct like so many other good things that once were on Tumblr, but at least partly preserved in the Internet Archive. I don’t know the exact provenance, but the artwork looks very much like that of American comics artist Bruce Timm (b. 1961). The image you see here is larger (click through if you want) than the original; I found it at the site PornHugo (warning: various popups).