I figured you guys would like this. A member of Iczerman's forum found it and linked to it there. It's a page from a comic book based on the short-lived Earthworm Jim TV series where Princess What's-Her-Name (who is a super-strong warrior in the cartoon, as opposed to the damsel-in-distress she is in the video games) displays some brief but incredibly impressive muscle growth:

http://ensho.net/ewj/1_14.html

After I found out about this, I posted about it on Wreck Shop's board. Two members there found a scene in another issue where the Princess wears Jim's supersuit and looks terrifically muscular while doing so:

http://ensho.net/ewj/3_16.html
http://ensho.net/ewj/3_17.html
http://ensho.net/ewj/3_18.html

(Credit goes to Randolph Carter for finding the muscle growth, and to Number6 and Zespara for finding the supersuit scene.)