Enterprise’s bold final season sees several multi-episode story arcs while establishing the foundation of what becomes the United Federation of Planets. The time-shattering season premiere concludes the Xindi arc, and the Temporal Cold War that has overshadowed the series since its premiere.

The season provides explanations to many disparities between this series and those past, including the Klingon appearance variation of the original series and the stark Vulcan cultural discrepancies.

As is common during the season, Enterprise crosses plots from previous Trek incarnations during its 3-part story arc involving fan favorite Brent Spiner guesting as Data creator Dr. Soong, who has created a genetically engineered clan of superhumans.

We revisit the mirror universe – first seen in the original series episode “Mirror, Mirror” and several times in Deep Space Nine – with a plot explaining how the alternated the universe evolved separately from our own.

4-01: Storm Front, Part I

Trapped in Earth during World War II, Enterprise investigates dramatic changes in the timeline as a result of the Temporal Cold War.

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4-02: Storm Front, Part II

With Silik’s help, Enterprise works to stop Vosk in Earth’s altered past.

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4-03: Home

As the Enterprise crew unwinds following the completion of their stressful Xindi mission. T’Pol and Trip visit Vulcan where she grapples with making a difficult decision.

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4-04: Borderland

Archer recruits Dr. Arik Soong from prison to track down a genetically-engineered group of radicals, whom he raised as children.

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4-05: Cold Station 12

The Augments attempt to steal the remaining genetically-engineered embryos from Cold Station 12.

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4-06: The Augments

After turning against him, Dr. Soong assists Enterprise track down the Augments.

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4-07: The Forge

After a terrorist attack on Vulcan kills Admiral Forest, an investigation leads Enterprise to believe that an secluded group called the Syrrannites is responsible.

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4-08: Awakening

T’Pau and T'Pol's mother, both Syrrannites, assist Archer and T’Pol search for the Kir'Shara and uncover the truth behind the terrorist attack.

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4-09: Kir’Shara

Tensions mount as different Vulcan factions fight for control of the Kir'Shara.

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4-10: Daedalus

The Enterprise assists Emory Erickson, the inventory of the transporter, who is secretly trying to save his long-lost son.

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4-11: Observer Effect

With Hoshi and Trip suffering from a fatal illness, Organians study the Enterprise crew.

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4-12: Babel One

While transporting a Tellarite ambassador, Enterprise rescues the crew of Shran’s ship and becomes caught up in a dispute between the Tellarites and Andorians.

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4-13: United

While investigating recent attacks, Archer mediates a quarrel between Shran and Ambassador Gral.

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4-14: The Aenar

Archer and Shran seek out the Aenar, an Andorian subspecies, to investigate their connection with recent attacks.

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4-15: Affliction

Phlox is abducted by Klingons and forced to find a cure to a fast-spreading illness. Meanwhile, Section 31 reaches out to Reed.

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4-16: Divergence

As Enterprise investigates sabotage, the crew continues their search for Dr. Phlox.

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4-17: Bound

Orion slave girls come aboard Enterprise and disrupt the ship’s crew.

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4-18: In a Mirror, Darkly

In the mirror universe, a radically different Enterprise crew searches for the technologically-superior U.S.S Defiant, trapped from our universe.

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4-19: In a Mirror, Darkly, Part II

A power-struggle ensues for control of the U.S.S Defiant in the mirror universe.

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4-20: Demons

A fanatical group of xenophobes attempt to rid Earth of all non-humans and end all extraterrestrial relations.

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4-21: Terra Prime

With the threat of destroying Starfleet Command, Enterprise races to stop Paxton.

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4-22: These Are the Voyages…

On the Enterprise-D holodeck, Riker and Troi look back at Enterprise's final mission.

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