What Star Trek: Enterprise Season 5 Would Have Looked Like

Before Star Trek: Enterprise was abruptly canceled after season 4, its producers had ambitious plans for a fifth season. It would have delved into the buildup to the Romulan War, expanded on the Mirror Universe storyline, shown the origin of the Borg Queen and introduced a refitted Enterprise with a secondary hull, bringing the ship one step closer to the classic Star Trek look.

Here's a look at what could have been, and at why it never happened.

Enterprise tried to reinvent Star Trek before it found its footing

When Star Trek was revitalized with The Next Generation, its massive success led to two follow-up series, Deep Space Nine and Voyager. Both shows ran for seven seasons despite declining ratings. To reinvigorate the franchise, producers took a bold approach with the next installment, simply titled Enterprise: a prequel set in the early days of Starfleet, before the formation of the Federation, in an effort to make Star Trek feel more grounded and relatable.

Even the show's title initially dropped Star Trek, signaling a desire to distance itself from the franchise's more traditional sci-fi tropes and attract a wider audience. That effort extended to the opening credits, which broke with tradition by skipping another Jerry Goldsmith instrumental theme in favor of Faith of the Heart, a soft rock ballad with lyrics. It was an unprecedented choice for the franchise.

The downward trend continued anyway. To boost interest, the show shifted from an episodic format to serialized storytelling in season 3, introducing a war arc that echoed real world post 9/11 themes. By season 4, Enterprise was finally finding its footing, or growing its beard, a phrase popularized by The Next Generation. Unfortunately, it was too late. The show was canceled due to dwindling viewership, becoming the first live action spinoff since the original series to last less than seven seasons. Before that cancellation, though, plans were already underway for season 5.

The Romulans were set to be season 5's primary antagonists

In a season 2 episode, Enterprise has an early, albeit indirect, encounter with the Romulans, foreshadowing their larger role in season 4. After Enterprise succeeded in resolving tensions between the Vulcans, Andorians and Tellarites, the Romulans reemerged with a sinister agenda, seeking to destabilize the region and make sure the quadrant's major powers stayed divided and in conflict.

That storyline was set to continue into season 5, exploring the origins of the Federation as these four species unite against the Romulans, their common enemy. At the same time, it would have set the stage for the looming Romulan War, with the Romulans positioned as the season's primary antagonists.

In fact, Future Guy, the mysterious figure guiding the temporal Cold War and manipulating events from the shadows, was at one point considered to be a Romulan. That would have tied into the Romulan War, with a future Romulan trying to instigate conflict and prevent the formation of the Federation. At another point, the writers even toyed with revealing him to be Archer's future self, creating a time loop paradox in which Archer would end up influencing his own past.

The temporal Cold War never had a clear endgame

The reality was that the writers never had a clear plan for Future Guy or the temporal Cold War. They were making it up as they went along, with no concrete endgame in mind.

That lack of direction contributed to one of the biggest criticisms of Enterprise: the temporal Cold War felt out of place in a series meant to explore the early, unpolished days of Starfleet. Instead of focusing solely on the challenges of deep space exploration, first contact diplomacy and the rough trial and error nature of early warp travel, the show often leaned into convoluted time travel plots and shadowy factions from the far future. Many fans felt this undercut the premise, since Enterprise was supposed to be about the founding of the Federation, not a battle between mysterious time travelers manipulating history from the sidelines.

William Shatner pitched a Mirror Universe story starring Tiberius

The original concept for Enterprise's Mirror Universe two parter in season 4 stemmed from an idea developed by authors Garfield and Judith Reeves-Stevens, who had previously collaborated with William Shatner on his Star Trek novels. Their pitch reimagined the Tantalus field from the original series episode Mirror, Mirror not as a disintegration weapon but as a device that sent prisoners back in time to a sealed penal colony.

The Enterprise NX-01 would then stumble upon this colony and discover none other than Tiberius, the Mirror Universe version of Captain Kirk, stranded in the past. Believing he had finally found a way back to his own time and universe, Tiberius would try to use Enterprise's transporter, only to learn that the Mirror Universe didn't exist yet. Its divergence from the Prime Universe hadn't happened, and somehow both Tiberius and Archer were destined to play a role in its creation.

Shatner pitched this idea to Enterprise's showrunners, but they had already been developing a different time travel storyline written by Mike Sussman. In that version, Shatner would have played an ancestor of Kirk whom the time traveler Daniels intended to use to replace the real Kirk at a critical historical event when Kirk mysteriously disappeared. Shatner was reportedly unenthusiastic about the idea, and when negotiations for his appearance fell through, Sussman went ahead with an entirely different Mirror Universe two parter, one centered on the discovery of the USS Defiant from the original series episode The Tholian Web.

Manny Coto planned a Mirror Universe miniseries for season 5

For season 5, new showrunner Manny Coto planned a miniseries within a series, with four or five episodes devoted to following up on the season 4 Mirror Universe episode In a Mirror, Darkly, which sees Hoshi Sato become Empress of the Terran Empire. Not only that, but there was even some talk about setting the entire fifth season in the Mirror Universe.

Enterprise would have revisited the cloud city of Stratos

Enterprise was also set to revisit Stratos, the floating metropolis first introduced in the original series episode The Cloud Minders. Coto envisioned a two part episode exploring the early days of Ardanan society, long before the stark class divide seen in the original series.

The storyline would have depicted the planet's growing social unrest as tensions rose between the wealthy elite living in luxury on Stratos and the oppressed workers forced to toil on the surface below. Stratos, hailed by Spock as the greatest example of antigravity engineering, was also the Federation's primary supplier of zenite, a crucial mineral. Given its economic significance, Coto intended for Archer and the NX-01 to be the first Starfleet crew to make contact with Ardana, potentially laying the groundwork for the social and political turmoil that would define the planet a century later.

The Borg Queen's origin and Larry Niven's Kzinti were on the table

One of the ambitious ideas for season 5 was an episode exploring the origin of the Borg Queen. The story would have connected directly to the season 2 episode Regeneration, in which the NX-01 encounters the Borg left over from First Contact and inadvertently sets the stage for the Borg's rise. First Contact and Voyager actress Alice Krige was on tap to return as a Starfleet medical tech who would have become the Queen after being assimilated.

Another potential unmade storyline was a planned episode that would have brought the Kzinti, Larry Niven's race of warlike, honor bound feline aliens, into modern Star Trek. Originally from Niven's Known Space series, the Kzinti made their Star Trek debut in the animated series episode The Slaver Weapon. One of the show's writers was eager to bring them into Enterprise and even commissioned a rough rendering of a Kzinti starship.

T'Pol's father would have been revealed as a Romulan agent

While the show had previously introduced T'Pol's mother, her father remained somewhat of a mystery. Season 5 would have revealed that he was actually a Romulan agent operating on Vulcan. That twist would have made T'Pol half Romulan, explaining her occasional emotional tendencies and adding a new layer to her character's struggle between logic and emotion.

Another major change would have been the addition of Commander Shran, played by Jeffrey Combs, as a regular member of Archer's crew. Shran, a fan favorite Andorian, had appeared in every season, and Coto planned for him to take on a permanent role aboard the NX-01 as an adviser, much like T'Pol's role in the early seasons. This would have strengthened the show's exploration of Andorian and Vulcan relations and foreshadowed the eventual formation of the Federation.

Additionally, one episode would have focused on the construction of humanity's first starbase, tentatively titled Starbase 1. It would have given the audience a look at the early days of Starfleet's expansion into deep space and the foundation of the space stations that would become essential to future Star Trek series.

The NX-01 would have gained a secondary hull

One of the ideas explored for the unmade fifth season was a major refit of the NX-01, bringing it visually closer to the classic Star Trek design. Doug Drexler, one of the show's designers, envisioned the ship receiving a secondary hull, with the warp engine pylons extending down to connect with the new section. That would have turned the NX-01 into a clear precursor to the Constitution class starships.

Drexler had always planned for this evolution, believing that after four years of tough spacefaring experience, with the crew repeatedly facing overwhelming threats, Starfleet would upgrade the ship for future missions.

And of course, had the show not been canceled, season 5 would have seen the return of Trip, whose death in the series finale felt unnecessary and purely for shock value to me. Then again, since the series finale was just a holodeck program Riker was running, who's to say Trip is really dead?

Franchise fatigue and creative missteps sank Enterprise

So what went wrong? Despite its ambitious ideas and eventual course correction, Enterprise struggled with dwindling ratings that led to its cancellation after four seasons. One of the biggest factors was Star Trek franchise fatigue. By the time Enterprise premiered in 2001, Star Trek had been continuously on the air for nearly 15 years with TNG, Deep Space Nine and Voyager.

Voyager had pushed futuristic technology so far that going back to a more primitive era of space exploration felt underwhelming by comparison, making Enterprise seem less exciting. Efforts to differentiate the show, such as dropping Star Trek from the title and replacing the franchise's signature orchestral theme with a soft rock song, only alienated longtime fans. Meanwhile, attempts to boost ratings like the oversexualized decontamination chamber scenes and gratuitous nudity, particularly with T'Pol, felt cheap and lowbrow.

While Enterprise eventually embraced more exciting storylines, it was too little, too late. The show's best material didn't arrive until season 4, by which point many viewers had already tuned out. In the end, Enterprise's failure wasn't due to a lack of potential but to a series of creative missteps, misguided attempts to chase a new audience and a general sense of exhaustion within the franchise itself.

Which of these unmade season 5 storylines would you most have wanted to see?