Now, bear in mind that one reader's 'quality' is another reader's 'toilet paper,' so I'm going to concentrate on the size aspect.
But how long is a fanfic before it's considered an 'Epic'?

I asked a lot of people, and I got a lot of answers. From the reasonable to the ridiculous, they covered nearly every possible size of fanfic there is. I'd have to determine it on my own.

I decided to go with an average size of 500k. Maybe a little more, maybe a little less.
Now, before you decide to cyber-lynch me because your favorite fanfic might not qualify, just listen to the criteria I decided to use

1. An average size of 500k, with the file(s) in .txt format. .Doc doesn't count, as they are larger by nature.
2. This average includes multiple-file stories. If said fanfic is stored on the author's website in more than one file (one chapter per file is a common method), if the total size of the files is near the minimum, then they'd qualify.
3. This average includes sequels and sidestories. If a 'fic and its sequel add up to near the minimum, then they would both appear here.

Alright, I'll admit to something here. Even having read as many Ranma fanfics as I have, I'm positive that I don't know nearly as many epic-sized 'fics as there are. So I need your help.
If you know of a story that would meet the above qualifications, email me the title, author, and URL (if you know it). I'd like to get as many as I can onto this page.

Enough babbling, on to the Epics.

Altaverses 

Divergences

Continuations 

Fusions