Joe Kubert's Viking Prince homages in Justice League Unlimited.

In the episode, "To Another Shore" in Justice League Unlimited. Gorilla Grodd (Powers Booth) narrates the origin of Prince Jon, the Viking Prince. The narration is set to a series of images drawn in style and indeed mostly adapted from the art of Joe Kubert. On top, are the comic panels and on the bottom, stills from the episode. Some of these, I'm just guessing. I mean, Prince Jon fought a shark three or four times and his series only lasted 24 issues! It also appears they flipped the image for most, if not all these panels. If you're wondering what the heck Sgt. Rock is doing in some of the panels, that's because the Viking Prince was frozen and later revived, a la Captain America.

The video from where I got the screenshots is here: 

New Gods homages in Superman TAS

These are shots from the episode "Apokolips Now Part 1" that were modeled after iconic panels in the New Gods comics.