A big part of Star Trek's 22nd century history could have been answered if Star Trek: Enterprise season 5 had happened. United Paramount Network (UPN) canceled Star Trek: Enterprise after season 4 due to myriad factors, such as low ratings and a shift of network priorities. Enterprise's cancellation marked the end of executive producer Rick Berman's 18-year stewardship of the Star Trek franchise.
While the writing was on the wall regarding the fate of Star Trek: Enterprise, season 4's showrunner, Manny Coto, and his writing staff had preliminary ideas brewing for Star Trek: Enterprise season 5. Coto was a fan of Star Trek: The Original Series' Mirror Universe, and he planned to return to the alternate reality to follow up Enterprise season 4's "In a Mirror, Darkly" two-parter. Commander Shran (Jeffrey Combs) would also have become the first Andorian to join Captain Jonathan Archer's (Scott Bakula) NX-01 Enterprise crew.
Star Trek: Enterprise Season 5 Would Have Told The Romulan War Story Hinted At By The Original Series
T'Pol Could Have Also Had A Big Romulan Reveal
Star Trek: Enterprise season 5's central story might have been the Romulan War waged between Starfleet and the Romulan Star Empire. Star Trek: The Original Series season 1's classic episode, "Balance of Terror," introduced the Romulans and revealed that, in the 22nd century, a war between humans and the insidious aliens was fought "with primitive atomic weapons." However, Star Trek: Enterprise would likely have simply retconned this, placing Captain Archer and the NX-01 Enterprise on the front lines.
Todd Stashwick, who played Captain Liam Shaw in Star Trek: Picard season 3, portrayed a Romulan operative named Talok who posed as a Vulcan in Star Trek: Enterprise season 4.
Star Trek: Enterprise writer Mike Sussman also wanted to pitch the reveal that T'Pol's unseen father was a Romulan. This would have canonically established T'Pol to be half-Romulan, and it would have retroactively explained aspects of T'Pol's atypical behavior as a Vulcan in previous seasons of Star Trek: Enterprise. However, since this Romulan story was never told because Star Trek: Enterprise season 5 didn't happen, T'Pol remains canonically a full Vulcan.
Star Trek: Enterprise’s Romulan War Story Would Have Had One Big Problem To Retcon
Enterprise Has Retconned Before
Of course, retcons were nothing new to Star Trek: Enterprise. Captain Archer's NX-01 encountered the Ferengi in Star Trek: Enterprise season 1, centuries before Star Trek: The Next Generation's era, although Enterprise's crew never learned the name of the capitalistic race. Enterprise also brought in the Borg, who tried to assimilate the NX-01. Again, Archer failed to learn the name of the deadly cyborg race before destroying them.
There may be a chance Star Trek fans could see the Romulan War depicted on the big screen.While Star Trek: Enterprise season 5's plans are unlikely to ever come to fruition now that it's been two decades since Scott Bakula's prequel ended, there may be a chance Star Trek fans could see the Romulan War depicted on the big screen. Director Toby Haynes pitched a Star Trek Origin movie set decades before J.J. Abrams' Star Trek (2009), and it could take place in the era of the Romulan War. However, the status of Haynes' Star Trek Origin prequel is unclear, and it may join Star Trek: Enterprise season 5 as a Star Trek project that doesn't bring the Romulan War to fruition.