Star Trek: Enterprise (titled Enterprise for it’s first two seasons) is a TV series that aired on UPN from September 26, 2001 to May 13, 2005 for four seasons. It is a prequel spinoff of Star Trek.

Guest Characters

(Note: The nature of the Star Trek franchise means that character “crossovers” between shows may be from alternate timelines or realities, robot or hologram duplicates, shapeshifters in disguise, visions created by godlike aliens, or any number of science fiction conceits. I will still count them as crossovers but will make note of when a character who appears is not the original version of a character.

The Zefram Cochrane from “In a Mirror Darkly” was the mirror version of the character and was a combination of archive footage from the film Star Trek: First Contact and a body double.

Surak appears as a spirit vision in the episode “Awakening”. His previous appearance in the original Star Trek was a vision created by aliens called the Excalibans. The Excalibans also created a vision of Phillip Green so his appearance in the episode “Demons” is technically the first time we see the “real” green.”

The finale episode “These are the Voyages…” takes place inside of a holodeck simulation during the Star Trek: The Next Generation episode “The Pegasus”. The appearances of Data and Picard are voice only and Picard’s voice is archive audio.)

Mobile & Web Series

T’Pol, Travis Mayweather, Malcolm Reed, and “Trip” Tucker appear in hologram form in the 2023 Very Short Treks episode “Holograms All the Way Down”. Only Tucker is voiced. This episode is not a part of canon.

Feature Film Crossovers:

Though the character originates from the original Star Trek television series, James Cromwell reprises his Star Trek: First Contact role as Zefram Cochrane in the episode “Broken Bow”. Footage from First Contact is used in the episode “In a Mirror, Darkly” to create a mirror universe version of those events.