Star Trek (franchise)

The Star Trek franchise has made several references to the Doctor Who universe, and the two also share many similarities.

Television

 * A computer console seen in the Star Trek: The Next Generation episode "The Neutral Zone" shows the names of the first six actors to play the Doctor. Despite this being an obvious reference, a basic mistake was made where Peter Davison's name was misspelled as "Peter Davidson".
 * The Argolis Cluster, first mentioned in the Next Generation episode "I Borg", was named after the planet Argolis (DW: The Leisure Hive).
 * "Future Tense", an episode of Star Trek: Enterprise, features a TARDIS-like spacecraft that can travel through time, is bigger on the inside than on the outside, and has an interior design featuring TARDIS-like roundels. The show's production team has acknowledged this as an homage.

Other media

 * The Star Trek novel "Ishmael" makes an indirect reference to the Time Lords, a direct reference to Metebelis crystals, and features cameos by the Second Doctor and the Fourth Doctor. (Per a directive from Trek creator Gene Roddenberry and the franchise owners, Paramount Pictures, novels are not considered part of Trek canon.)
 * Several Star Trek stories have made mention of the use of "sonic screwdrivers" as Starfleet engineering tools.
 * A direct reference to the Doctor Who franchise is made in the novel My Enemy, My Ally which describes USS Enterprise crewmembers watching a Fourth Doctor episode.
 * The novel A Singular Destiny features an alien race called the Thals, although they have no connection to those seen in Doctor Who.
 * Greater Than The Sum features the names Lyton and Telos.

Watching the Clock

 * As a story focusing on the consequences of time travel, author Christopher L. Bennett has included many allusions to the the Doctor Who franchise in his Star Trek novel Department of Temporal Investigations: Watching the Clock.
 * The book features an epigram of the Tenth Doctor's line from "Blink" (credited to Stephen Moffat) describing time as "a big ball of wibbly-wobbly... timey-wimey... stuff."
 * The character of Rani Mohindra is named after Rani Chandra from The Sarah Jane Adventures and her actor, Anjli Mohindra.
 * A ship named the Verity is named after producer Verity Lambert.
 * The character of Ian Purvis is named after actors Ian Marter and Peter Purves.
 * Canary Wharf is also mentioned. While the novel makes no specific links to its status in Doctor Who, the author specifically mentions it, and its importance, in his online annotations. Likewise with Ealing.
 * The Tigellian chronic hysteresis is a reference to Tigella.
 * The unit of measurement known as a "Maloc" is based on the "Malcolm", coined by Dr. Malcolm Taylor.
 * The Shirna, archenemies of the already established Vogon were named after Shirna, partner of Vorg.
 * A "large, blue, boxlike artefact" is seen in a Federation storehouse of alien time-travel devices.
 * The character of Adrienne Markham is named after Adrienne Hill.
 * A planet is also described as having silver trees and an orange sky, and its inhabitants as a society who have been monitoring history for thousands of years.
 * A character Professor Vard, has a physical description reminiscent of the Second Doctor and displays the hubris and techno-babble associated with the Doctor in many incarnations.

Cast connections
To date, the only major Doctor Who star to have appeared in the Star Trek franchise is Daphne Ashbrook. Prior to playing the Eighth Doctor's companion, Grace Holloway, she played the character of Melora Pazlar on the Star Trek: Deep Space Nine episode, Melora.

In contrast to this however, there have been several major Star Trek stars who have appeared in the Doctor Who franchise. As regular cast members throughout the entire run of Deep Space Nine, Alexander Siddig and Nana Visitor are the most experienced Star Trek actors to appear in any Doctor Who franchise productions. Siddig portrayed Rosto in the Eighth Doctor audio dramas, Sisters of the Flame and The Vengeance of Morbius, whereas Visitor portrayed Olivia Colasanto in Torchwood: Miracle Day. Added to this, John de Lancie, who appeared as Q in twelve episodes across three Star Trek series', played Allen Shapiro in 'Miracle Day'', Allen Shapiro.

Simon Pegg is so far the only actor to have a lead role in a Star Trek feature film, Montgomery Scott in Star Trek, and have significant involvement in Doctor Who. Not only did he play The Editor in The Long Game, but also narrated a series of Doctor Who Confidential, and performed vocal work for Big Finish in Invaders from Mars. Although David Warner appeared in the Star Trek films The Final Frontier, The Undiscovered Country and a two part TV story, he did so only in supporting roles. Also, his contributions to Doctor Who have only been audio work, including an alternative Doctor, and Isaac Newton among others for Big Finish, as well as Lord Azlok in the animated adventure, Dreamland.

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Crew connections
According to The Nth Doctor, in 1994 Leonard Nimoy, the actor who played the original Mr. Spock and who also directed two Star Trek feature films, was reportedly under consideration to direct one of the many aborted Doctor Who feature film projects under consideration during the 1989-96 interregnum.

TV movie composer John Debney also composed scores for the Star Trek: The Next Generation episode "The Pegasus" and the Star Trek:Deep Space Nine episodes "The Nagus" and "Progress". Tony Dow, who worked as visual effects producer for the TV movie, later directed the Deep Space Nine episode "Field of Fire".

A couple of writers have been shared between the televised incarnations of both franchises. Torchwood: Miracle Day writers Jane Espenson and John Shiban have also written episodes for Star Trek: Deep Space Nine and Star Trek: Enterprise respectively. A few other writers have written for the franchises in other media.

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Potential official crossover
In April, 2009, Russell T Davies revealed in an interview that he had considered writing a Doctor Who episode that crossed over with Star Trek Enterprise.
 * "I would have loved to have done a Star Trek crossover," said Davies. "The very first year, we talked about it. Then Star Trek finally went off air. Landing the Tardis on board the Enterprise would have been magnificent. Can you imagine what their script department would have wanted, and what I would have wanted? It would have been the biggest battle."

Given the vast settings of both franchises and the number of companies involved in the international rights, it is highly unlikely such an episode would have been made. In addition, there have been several references made to Star Trek as an entertainment franchise in Doctor Who — most notably when Rose Tyler dubs the Doctor "Mr. Spock" in DW: The Empty Child — which could have presented a continuity challenge. Star Trek, for its part, has never made a direct reference to Doctor Who in any TV episode or film, beyond a few visual references and in-jokes not intended to link to the canon; the direct reference to the series that occurs in the novel My Enemy, My Ally has no bearing on canon as in the 1990s Paramount Pictures took the (for some) controversial step of announcing what aspects of the Trek franchise would be considered canon; the novels, Paramount decreed, are not.

Other information

 * The fan novella The Doctor and the Enterprise by Jean Airey, initially was published privately as a stand-alone fanzine and then in a professional edition in 1989 by Pioneer Books. Many other amateur fan fiction crossovers between the two universes have been written over the years, though Airey's book remains (as of 2009) the only one to be published professionally, if unofficially.