Talos IV

Talos IV was the inhabited M-class fourth planet of the Talos system, which was a part of the Talos star group. It was located in the Alpha Quadrant, two light years away from Starbase 11. 

The planet was the homeworld of the Talosians, a telepathic humanoid species, as well as of the Talosian singing plant. The planet had an atmosphere of oxygen-nitrogen and a gravity that was 0.9 of Earth standard. 

Location
In 2254, the position and orbital path of Talos IV in an inner system map was displayed on the bridge of the USS Enterprise (NCC-1701). This planet, located three astronomical units from the binary stars Talos A and Talos B, had a highly inclined orbit. (, production art)

In 2257, the coordinates of Talos IV were noted as 7-4-9 Mark 1-4-8. 

History
Talos IV had a thriving population, until several thousand years before 2257 when a nuclear war caused a near-extinction level event. 

23rd century
Talos IV began to support life on the surface at some point prior to the mid-23rd century. The planet's deep underground had been inhabited by the Talosians, who had evolved as an old and weakened species with enormous mental powers. In 2254, the planet was visited by the Federation starship USS Enterprise (NCC-1701) – under the command of Christopher Pike – after receiving a distress call faked by the Talosians supposedly from the SS Columbia, that had crash-landed on the planet in 2236. However, the only survivor of this crash was Vina, a female Human. 

The Federation imposed General Order 7 on Talos IV at some point after Pike's original visit. This order prevented anyone from approaching or making contact with the planet, under penalty of death. 

In 2257, Michael Burnham discovered that a sequence of numbers Spock had been obsessively writing for the past few weeks were actually the coordinates of Talos IV. She subsequently laid in a course, hoping to find answers to Spock's condition there. 

In 2267, Talos IV was revisited by the Enterprise while commandeered by Spock, in order to deliver Captain Pike there. Though Pike had been crippled by delta-particle radiation poisoning, he was able to live a normal life on the planet, together with Vina. 

24th century
In 2328, this was the destination for passengers traveling from Triskelion Orbital Station via commercial transport. , Wynsdey Adams, Loren Bivens, and Svetlana Reeves-Stevens traveled on the SS Kogin, and Mike Echols traveled on the SS Wisconsin. (, okudagram)

Background information
In the original story outline for (as fully reprinted in the reference book The Making of Star Trek, pp. 47-65), Talos IV was named Sirius IV and was inhabited by crab-like aliens who kidnapped Captain Robert April. The outline additionally described the surface of Sirius IV as "arid, rocky" and "the arid waste."

Near the end of, Gene Roddenberry wrote a memo to his production manager, Jim Paisley, which asked such questions as, "Regarding the surface of planet Talos IV, does the present description of the planet seem practical as regards available locations? Is the description and action presently in the rough draft suited for matching set construction, i.e. stage shooting of the more complicated dialogue portions of these Talos IV planet surface scenes." (Star Trek Creator: The Authorized Biography of Gene Roddenberry, p. 205)

In the script of "The Cage", Talos IV was described as "a violet-orange planet."

The set used for Talos IV's surface was built on Stage 16 of Desilu's Culver City lot. The set was designed by art directors Franz Bachelin and Pato Guzman. It included a massive painted backdrop that greatly enlarged the set's apparent size. Although the sky pictured in the backdrop was a cloudy gray, Director of Photography William E. Snyder and the production crew gave the sky a slight greenish tint using colored lights, thereby making the planetscape seem more alien. ( text commentary, TOS Season 1 DVD) The Talosian elevator created as part of the set was built on a platform, allowing the lift to descend without necessitating excavation below the soundstage's floor. ( text commentary, TOS Season 1 DVD) Underground interiors of Talos IV were filmed on Desilu Culver Stage 15. 

By, a budget of US$6,400 had been allocated for creation of the special effects necessary to show the exterior of Talos IV in "The Cage". (Star Trek Creator: The Authorized Biography of Gene Roddenberry, p. 206) To portray the planet as seen from the Enterprise upon approach in the original version of, footage of Talos IV was reused from "The Cage". The film clip was upgraded and matted into the Enterprise's bridge viewscreen. ( text commentary, TOS Season 1 DVD) The remastered versions of  and "The Menagerie, Part II", as well as the  remastered version of "The Cage", feature several updated, CG shots of Talos IV.

According to Star Trek Maps (chart D), Talos IV had two moons called Mone and Toh.

According to Star Trek: Star Charts (p. 34), Talos IV was a quarantined and non-aligned planet. Information on the planet's official name, government, capital city and population were not available to the Federation in the late 24th century. The Talosians were warp-capable 500,000 years ago.

According to The Worlds of the Federation, (p. 132) any distress signal or other communication supposedly originating from anywhere in the entire Talosian region was to be assumed false, with no exceptions. According to the reference book, the indigenous name of the planet was Clesik.

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