Season 0 of Star Trek: Enterprise premiered on null.

Season 1

7

.

2001

.

25 Episodes

Captain Jonathan Archer, son of the warp engine pioneer Henry, assembles a crew and takes the new starship Enterprise out into the heavens.

Season 2

7

.

2002

.

26 Episodes

In one short year, Jonathan Archer, captain of the starship Enterprise NX-01, has made a name for himself and his crew, both with his Starfleet superiors and perhaps less favorably with mankind's alien neighbors.

Season 3

7.4

.

2003

.

24 Episodes

After a devastating attack on Earth kills seven million people, Captain Archer and the crew of the NX-01 venture into the Delphic Expanse to seek out those responsible.

Season 4

7.4

.

2004

.

22 Episodes

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.