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| S | E | Hr | Gd | Title | Episode summary |
| 4 | 0 | 76 | Enterprise- Season Four | (2004-05), Fictional Date 2154. | |
| 4 | 1 | 77 | C+ | Storm Front part 1 | The Germans have invaded the east USA with alien help. Archer helps the resistance. |
| 4 | 2 | 78 | B- | Storm Front part 2 | The aliens and time portal are destroyed before they can leave, restoring the timeline. |
| 4 | 3 | 79 | B- | Home | As the ship is refitted, the crew has R&R. T'Pol marries a Vulcan as Trip watches. |
| 4 | 4 | 80 | C+ | Borderland (part 1) | Dr Sung's genetic engineered humans escape. Orions take some of crew as slaves. |
| 4 | 5 | 81 | C- | Cold Station 12 (part 2) | Sung's group terrorizes Station 12 and steals embryos and pathogens. |
| 4 | 6 | 82 | C- | The Augments (part 3) | Enterprise chases down the group and, with Sung's help, they are destroyed. |
| 4 | 7 | 83 | B+ | The Forge (part 1) | A bomb explodes in the earth embassy on Vulcan. T'Pol and Archer investigate. |
| 4 | 8 | 84 | A- | Awakening (part 2) | Archer keeps the katra and finds an artifact. Vulcans shoot Enterprise and bomb Archer. |
| 4 | 9 | 85 | B+ | Kir'Shara (part 3) | Enterprise helps the Andorians. Archer gets the Kir'Shara to Vulcan HQ & ends the war. |
| 4 | 10 | 86 | C- | Daedalus | The transporter inventor fakes a new machine to get his son out of virtual space. |
| 4 | 11 | 87 | B+ | Observer Effect | Two Organians take over hosts and observe reactions as Trip and Hoshie die of illness. |
| 4 | 12 | 88 | B+ | Babel One (part 1/3) | Enterprise ferries Tellurites to a peace conference, picks up Andorians, is attacked. |
| 4 | 13 | 89 | A | United (part 2/3) | A fleet of Vulcans, Tellurites & Andorians finds the Romulans. Archer fights a duel. |
| 4 | 14 | 90 | A- | The Aenar (part 3/3) | A side species of Andorians helps stop the Romulans. (although part 3, can stand alone) |
| 4 | 15 | 91 | B- | Affliction (part 1) | Diseased Klingons kidnap Flox to find a cure. Reed is in the brig. Trip joins Columbia. |
| 4 | 16 | 92 | B | Divergence (part 2) | Reed is out, Trip is back, Flox is rescued and the Klingons are cured (of course). |
| 4 | 17 | 93 | A | Bound | Orion slave girl pheromones enslave the men and Enterprise is almost lost to them. |
| 4 | 18 | 94 | C- | In A Mirror, Darkly part 1 | Follows the evil universe. They find an empty TOS era good guys ship via a Tholian rift. |
| 4 | 19 | 95 | C | In A Mirror, Darkly part 2 | The evil Archer plans to be emperor with the TOS ship from the future. Instead it's Hoshie! |
| 4 | 20 | 96 | B | Demons (part 1/3) | Earth isolationists have Trip's & T'Pol's baby, take over a Mars weapon -Aliens must leave! |
| 4 | 21 | 97 | A | Terra Prime (part 2/3) | Enterprise strike group takes back the Mars weapon. A multi-species conference is held. |
| 4 | 22 | 98 | A- | These Are The Voyages (part 3/3) | 10 yrs later, rescuing Andorian baby just before Trip dies & UFP forms. Riker "watches." |
| (although 4-22 is part 3 it can stand alone) | 4-22 was the last show of the series and possibly the Trek franchise. May, 13, 2005 |
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