The Best Episodes of Star Trek: Enterprise Season 4

Archer, T'Pol and T'Pau attempt to bring the Kir'Shara — an artifact believed to contain Surak's original writings — to the Vulcan capital, as the NX-01 gets involved in a Vulcan-Andorian military clash.

Director: David Livingston

Writer: Michael Sussman

Enterprise journeys to Babel with a Tellarite ambassador on board for peace talks with the Andorians, when a distress call from Shran is received.

Director: David Straiton

Writer: Michael Sussman, André Bormanis

Archer tries to unify the Andorians, Tellarites and Vulcans in a plan to capture a marauder ship threatening to destabilize the region.

Director: David Livingston

Writer: Garfield Reeves-Stevens, Judith Reeves-Stevens, Manny Coto

Earth's embassy on Vulcan is bombed, and the ensuing investigation puts Archer and T'Pol on the trail of a Vulcan religious faction hiding in a treacherous desert.

Director: Michael Grossman

Writer: Garfield Reeves-Stevens, Judith Reeves-Stevens

Archer visits Shran's icy homeworld to find an Andorian subspecies called the Aenar, to determine their connection to the marauder destroying ships in the region.

Director: Michael Vejar, Manny Coto

Writer: Manny Coto

In the mirror universe, Commander Archer mutinies against Captain Forrest in order to capture a future Earth ship found in Tholian space.

Director: James L. Conway

Writer: Michael Sussman

In the mirror universe, Archer commandeers the 23rd-century Defiant from the Tholians and uses it in a nefarious power grab.

Director: Marvin V. Rush

Writer: Michael Sussman

A human isolationist leader threatens to destroy Starfleet Command unless all aliens leave Earth immediately.

Director: Marvin V. Rush

Writer: N/A

Archer and T'Pol encounter the Syrrannites, a radical group hiding in the Vulcan desert, while the NX-01 crew contends with Vulcan power ploys.

Director: Roxann Dawson

Writer: André Bormanis

With Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of Phlox.

Director: David Barrett

Writer: Garfield Reeves-Stevens, Judith Reeves-Stevens

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

Director: Allan Kroeker

Writer: Michael Sussman

When genetic supermen left over from the Eugenics Wars hijack a Klingon ship, Archer must rely on their creator, the criminal Dr. Arik Soong, to help hunt them down.

Director: David Livingston

Writer: Ken LaZebnik

In defiance of their "father," Arik Soong's Augments devise a heinous plot against the Klingons which will surely lead to interstellar war.

Director: LeVar Burton

Writer: Michael Sussman

Non corporeal aliens study the Enterprise crew as they respond to a fatal viral infection brought on board from an away mission.

Director: Michael Vejar

Writer: Garfield Reeves-Stevens, Judith Reeves-Stevens

While Enterprise visits Earth for the launch of Columbia, Phlox is kidnapped and forced to help the Klingons deal with a grave threat toward their species.

Director: Michael Grossman

Writer: Michael Sussman, Manny Coto

Arik Soong leads his band of Augments to a medical facility where hundreds of genetically enhanced embryos are still stored, intending to retrieve them and bring them to life.

Director: Michael Vejar

Writer: Alan Brennert

A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.

Director: LeVar Burton

Writer: Manny Coto

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

Director: Allan Kroeker

Writer: Manny Coto

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

Director: Allan Kroeker, David Straiton

Writer: Manny Coto

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

Director: Allan Kroeker

Writer: Manny Coto

The inventor of the transporter, Emory Erickson, comes aboard Enterprise for a risky experiment.

Director: David Straiton

Writer: Ken LaZebnik, Alan Brennert

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.

Director: Allan Kroeker

Writer: Brannon Braga, Rick Berman