Before he became a mainstay at Mighty Marvel on Master of Kung Fu and The Punisher, like many up and coming artists, Mike Zeck practiced his craft at Charlton Comics. He did some stories for them in the middle 70's, and he did some really memorable and distinctive covers. Here are those covers.
Here's a link to Mike Zeck's official site, to see what he's up to these days. And here's a link to an unpublished Charlton cover. Just click on the last icon in the list.