This person is keeping the same basic characters, same basic plotline and events, et cetera.  However, it's being completely re-written:  The characters are being de-Sueified, the plot holes are being filled in, and the setting is getting superimposed over the Generic Locations.

As one might imagine, the original author (who has a very thin skin and no sense of humor) is in a massive snit about it.  As I hear it, she actually got the rewrite run off a fanfic site by crying plagiarism. 

Having read both the original piece and what existed of the re-write as of when the Suethor threw a fit...the re-write is no more "plagiarism" of the original piece than this is of this. 

Speaking of Doom, Trojie and I sporked that one a while back.
http://agenttrojie.livejournal.com/51066.html

You have no chance to survive make your time?
Well, that's what the original sounds like to me.