Whilst series one and two of
Black Mirror were shown on
Channel 4 in the UK, Netflix commissioned the series for 12 episodes (split into two series of six episodes) in September 2015 with a bid of $40 million, The six episodes in series four were released on Netflix simultaneously on 29 December 2017.
Conception and writing The episode was written in November 2016 by series creator
Charlie Brooker along with William Bridges, who previously co-wrote series 3 episode "
Shut Up and Dance". Brooker said that the episode was based around doing "a 'Black Mirror' version of a space epic", an idea that began during the filming of series three episode "
Playtest". Though sometimes very bleak, the episode has comedy that may be considered atypical for the show, Brooker tells
Den of Geek that the episode is not intended as an attack on
Star Trek, a show that was "wildly ahead of its time". Originally, Daly's character was more unlikeable from the episode's beginning, but this was changed so that Daly strangling Walton would be more of a surprise. Brooker states that Daly dies of starvation after the events in the episode, due to the "Do Not Disturb" sign he puts on his door. Haynes considered ending the episode with the shot of Daly in his apartment, rather than the happier scene of the crew playing
Infinity, but Brooker reassured him that not every
Black Mirror episode had to end unhappily. In the episode's initial draft, every character had a "Grain" implanted in them—a device that recorded their vision and hearing, similar to what was featured in the series one episode "
The Entire History of You". This explained why virtual Nanette had the memories of real-life Nanette. Brooker decided that showing the Grain contents alongside Daly getting each person's DNA was too much detail, which led to the Grain aspect being cut. Shania says "It's a fucking gizmo" in response to a question from Nanette about how Daly's technology works, as a way to comment that the technology not making sense did not matter. Milioti accepted the role having only seen a few pages of the script; she said in an interview that Nanette is "a woman in charge [fighting] against a small-minded, misogynist bully". Simpson was ill with the flu during filming but noted that his character was intended to be skinny.
Aaron Paul makes a vocal cameo appearance at the end of the episode, whilst Plemons' fiancée
Kirsten Dunst makes an uncredited appearance in the office background early on, after asking the director while on set. He then came up with the idea that the best voice would be Paul's character
Jesse Pinkman from
Breaking Bad, a show that featured Plemons in the role of
Todd Alquist. Paul accepted the part on the condition that his appearance in this episode did not preclude him from being part of another
Black Mirror episode. The part was one of the last elements of the episode to be finished, and it surprised members of the cast when it was screened. Inspired by the style of 1960s television, the episode used
Dutch angles during the spaceship scenes. Cinematography towards the end was designed to evoke
Star Trek. Haynes was a fan of
Star Trek, and helped to add details, such as putting Lowry in a
red uniform since she was the first to be killed off. A number of
Star Wars references are also included. Brooker says the episode features more special effects than any previous episode of the show.
Music British composer
Daniel Pemberton composed the episode's score. A fan of
Black Mirror, Pemberton had worked with Brooker before on a video game magazine in the 1990s. Pemberton was between compositions for ''
Molly's Game and All the Money in the World, but despite being busy he accepted the job for "USS Callister
". Pemberton says the score consisted of three styles: the Space Fleet'' music, the real world and Daly's video game. He also describes the soundtrack as "almost like two film scores that slowly collide". A vinyl version of the soundtrack, featuring as its cover the
Butcher Billy-designed
Space Fleet poster seen on the episode, was released on
Record Store Day 2019.
Marketing In May 2017, a
Reddit post unofficially announced the names and directors of the six episodes in series 4 of
Black Mirror. The first trailer for the series was released by Netflix on 25 August 2017, and contained the six episode titles. In September 2017, two photos from the fourth season were released, including one from "USS
Callister". Beginning on 24 November 2017, Netflix published a series of posters and trailers for the fourth series of the show, referred to as the "13 Days of
Black Mirror". The art for "USS
Callister" was released on 4 December, and the trailer on 5 December. The following day, Netflix published a trailer featuring an amalgamation of scenes from the fourth series, which announced that the series would be released on 29 December. Prior to the series' release, "USS
Callister" was described as the "most anticipated new episode" by one source; ==Analysis==