I remember this. It was pretty epic. I have to go find those back issues now. I think it spanned one issue of New Warriors and one of Thor.
Edit: It was MIghty Thor 411 and 412 (thanks, X-Man). New Warriors didn’t have their own book yet. So much for memory. Mine, anyway.
Gonna see if my local has these when I go in for Free Comic Book Day tomorrow. Glad man-thing’s post reminded me of this!