Captain Archer wants to convert curiosity into deeds and decides to enter a ship floating in space. Hoshi has trouble adjusting to life on Enterprise.

While exploring an uncharted planet, Enterprise crew members encounter a group of aliens who are hunting down indigenous creatures for recreation. During their exploration, Archer is mesmerized by visions of an elusive, yet familiar woman who needs his help.

Starfleet orders Enterprise to return home when the crew seemingly causes the destruction of an alien planet. However, a visit from Crewman Daniels leads Archer to believe that this disaster was the plot of one of the factions from the temporal cold war.

Daniels and Archer must find a way back to the 22nd century in order to make sure history plays out as it should. Meanwhile, on board Enterprise, the Suliban have taken over the ship, but Reed, Trip, and T'Pol formulate a plan to eject the aliens.

Archer and Tucker are arrested and placed on a prisoner transport heading for a penal colony, Canamar. They won't have a chance to correct this error, as one of the inmates plots a takeover of the ship.

An alien race known as the Xindi launch an attack on Earth, causing great casualties and massive damage. As Enterprise heads back home, an unlikely source informs Archer about the Xindi and that their next attack will destroy Earth.

Captain Archer and his crew set out to gain information about the mysterious and antagonistic Xindi race.

Archer sets out on a suicide mission to destroy the Xindi superweapon as Enterprise faces a brutal attack.

Archer puts his life on the line in a risky gambit to intercept the Xindi superweapon and disarm it from within.

Archer and the NX-01 find themselves in Earth's past, with events of World War II altered by the Temporal Cold War.

With Silik's help, Archer hones in on the temporal operative who altered Earth's past and threatens to destroy all of time.

Once the NX-01 finally returns to Earth, the weary crewmen face repercussions of their journeys, both positive and negative.

As a gift for negotiating with the Orion Syndicate, Captain Archer receives three Orion Slave Girls.

Six years in the future, an emotional Captain Archer and the crew return to Earth to face the decommission of Enterprise and signing of the Federation charter.