Heretic E6M1-E6M3?

What were Heretic E6M1 through E6M3 for? Leftovers of an episode? Or something else?

One of them were originally a DM map for Doom2 by American McGee.

Another is based on the Raven Software offices (back then).

E6M3 is idmap01 and can be found here.

I guess this almost half episode was supposed to be fun deathmatch fun, at least I guess so.

Not really. There were two of these maps in original Heretic as well as E4M1 and E4M2.

Correction. American McGee's map is featured as E4M1 in Heretic. The other two are new for the expansion.

I see...But if it looks like it was supposed to be DM...Why is there enemies?

Well, unlike Quake and up, the absence of any monsters isn't a default rule for deathmatch. Besides, their presence is required for singleplayer and cooperative purposes.

One source port named the maps and the episode, showing them on the menu...can't remember which one though.

The Ultimate DooMer said:
One source port named the maps and the episode, showing them on the menu...can't remember which one though.

I think that came from a FAQ (which based some of the names on the comments by someone from Raven Software). It made its way to the Doom wiki even, giving the maps' articles those names. They've since been moved to "nameless" titles, though, since in the game "as is" itself the levels have no names.

Does anyone know what these Doom episodes are?

I had never seen them in the original Doom.

I mean the three extra episodes

-Visions of Eternity

-City of Corpses

-Director's Cut

I had never seen or heard of them in my life.

Not sure what's worse, the fact you necro'd a 15 year old thread or the fact your post has no relevance to the topic at hand.