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- Season 4 overviewOct 8, 2004-May 13, 200522 episodesSeason 4 episodes1. Storm Front Oct 8, 2004
- Archer awakens on Earth in the 1940s, and aliens are aiding the Nazis.
- 2. Storm Front Oct 15, 2004
- Archer and the crew must destroy a time machine to stop aliens from obliterating countless eras.
- 3. Home Oct 22, 2004
- Trip goes with T'Pol to the planet Vulcan to meet her mother, T'Les.
- 4. Borderland Oct 29, 2004
- Genetically engineered humans try to create a war with the Klingons.
- 5. Cold Station 12 Nov 5, 2004
- Dr. Arik Soong tries to create an army of superhuman Augments.
- 6. The Augments Nov 12, 2004
- The Enterprise crew pursues Dr. Soong across hostile Klingon space.
- 7. The Forge Nov 19, 2004
- The Enterprise goes to Vulcan to investigate a suicide bombing at Earth's embassy.
- 8. Awakening Nov 26, 2004
- T'Pol's mother joins a revolutionary group being targeted for destruction.
- 9. Kir'Shara Dec 3, 2004
- Archer tries to unveil a revered artifact that could change Vulcan society.
- 10. Daedalus Jan 14, 2005
- The inventor of the transporter device tests new transporter upgrades on the Enterprise.
- 11. Observer Effect Jan 21, 2005
- Aliens possess the bodies of crew members to observe humanity's reaction to tragedy.
- 12. Babel One Jan 28, 2005
- The Enterprise is attacked by a Romulan vessel, during a peace conference.
- 13. United Feb 4, 2005
- Trapped on a remote-controlled Romulan ship, Trip and Malcolm must outwit their captors to escape.
- 14. The Aenar Feb 11, 2005
- Archer and the crew try to prevent intergalactic war between the Romulans and the Andorians.
- 15. Affliction Feb 18, 2005
- Trip begins his new assignment aboard the Enterprise's companion ship; Klingons capture Phlox.
- 16. Divergence Feb 25, 2005
- Archer pursues the kidnapped Dr. Phlox deep into Klingon territory.
- 17. Bound Apr 15, 2005
- The Orions present Archer with three alluring Orion women, who seduce all the men on board.
- 18. In a Mirror, Darkly Apr 22, 2005
- An imperialistic version of the Enterprise crew makes an astonishing discovery.
- 19. In a Mirror, Darkly Apr 29, 2005
- Power-hungry Archer and the crew use the Defiant to thwart a Tholian attack.
- 20. Demons May 6, 2005
- Archer and the crew uncover a plot by a radical anti-alien group.
- 21. Terra Prime May 13, 2005
- A radical human isolationist plans violence to purge Earth of aliens.
- 22. These Are the Voyages ... May 13, 2005
- Archer and the crew return to Earth to face the decommissioning of the Enterprise.