Season 4
Upon returning home after preventing a second Xindi attack, Enterprise explores cultural shifts on Vulcan; forges alliances with Earth's neighbors in the face of Romulan aggression; deals with a plague inside the Klingon Empire; explores the Mirror Universe; and overcomes xenophobic elements to lead an interstellar community.
Episodes
1 Storm Front (1) Oct 8, 2004 
2 Storm Front (2) Oct 15, 2004 
3 Home Oct 22, 2004 
4 Borderland (1) Oct 29, 2004 
5 Cold Station 12 (2) Nov 5, 2004 
6 The Augments (3) Nov 12, 2004 
7 The Forge (1) Nov 19, 2004 
8 Awakening (2) Nov 26, 2004 
9 Kir'Shara (3) Dec 3, 2004 
10 Daedalus Jan 14, 2005 
11 Observer Effect Jan 21, 2005 
12 Babel One (1) Jan 28, 2005 
13 United (2) Feb 4, 2005 
14 The Aenar (3) Feb 11, 2005 
15 Affliction (1) Feb 18, 2005 
16 Divergence (2) Feb 25, 2005 
17 Bound Apr 15, 2005 
18 In a Mirror, Darkly (1) Apr 22, 2005 
19 In a Mirror, Darkly (2) Apr 29, 2005 
20 Demons (1) May 6, 2005 
21 Terra Prime (2) May 13, 2005 
22 These Are the Voyages... May 13, 2005