I heard of that and think it would be such a cool thing for any fandom to try.
before I continue…. I AM NOT A LAWYER. YOU’RE ALL ON YOUR OWN IF I’M WRONG AND ANY OF YOU GET A CEASE AND DESIST NOTICE.
I think it would be legally safe enough if
A)the audio is from an incomplete episode. None of the unfinished season two audio is on any licensed items being sold.
B) the audio is a medley of clips from different episodes as that makes it easier to cite ‘fair use’ clause.
Fanart is generally considered harmless copyright infringement. Copyright holders only send cease and desist orders to those who interfere with something like sales or (in rarer instances) marketing of a product.
want to not waste your time on a project that gets taken down? Ask yourself
-am I making any money off this? If it’s for an artist alley then was the price merely reflecting cost of materials (paint, paper) and my labor or did I jack up the price because it’s Zim?
-did I interfere with an item’s sale? Episodes are obvious but you might recall my mentioning a brony who made downloadable “My Little Pony: Magic the Gathering” decks without changing the rules of the game. Copyrighted characters and free access to a game you’re supposed to buy? Yikes. double whammy.
-If my work looks so polished that it looks like the real deal.. will it interfere with a holder’s business plans? My Little Pony: Fighting Is Magic was free and there was no fighting game to rip off yet it was still taken down because it looked like a real product that endorsed violence. That’s a conflict of interest.
Keep all those things in mind when you do a fan project and I think you’ll be fine.