two headed monster in doom 3 and pinky birth/meat sacks in hell?

[TMAC Blade]

what is this demon and what was it before it was this? or was it always like that? also i heard of the pinky birth sacks that can be seen in the hell levels but i havnt seen one yet. where are those?

[simple cat]

Some info about Pinky
http://doom.wikia.com/wiki/Demon_(Doom_3)
and Maggots
http://doom.wikia.com/wiki/Maggot