Despite being the correct age I was never into G.I. Joe as a kid. After all, giant fighty space robots beat regular-sized fighty soldiers. I'm vaguely familiar with a few of the characters through the backup stories that used to be reprinted (though infrequently read) in the back of my childhood Transformers comics, but I have nothing in the way of nostalgia for the series. I did, however, spend a part of this evening watching my way through G.I. Joe Resolute. It's a recently finished micro-series, written by Warren Ellis (of A-Bunch-Of-My-Favourite-Comics fame) and directed by Joaquim dos Santos (who apparently is notable for his work on the final few episodes of Avatar, and probably other things too). The animation is pretty spiffy too. Taking the form of 10 (or 11, depending on how you number them) 5-ish minute episodes, it's hugely entertaining, and also surprisingly brutal in places. You'll probably recognise a few familiar voice actors in there as well.
In other, related news, check out this, from the 90s. It seems bizarre to imagine a time when the word extreme was used without irony, but here it is.