Title: List of Star Trek television series
Content:  Star Trek: Discovery begins as a prequel to The Original Series, set roughly ten years prior. It premiered September 24, 2017 in the United States and Canada on CBS before moving to CBS All Access, while Netflix streams the series outside the United States and is also providing most of the series' funding. The series centers on the voyages of the USS Discovery, a unique starship with an experimental "spore drive", commanded in Season 1 by Captain Gabriel Lorca (Jason Isaacs), in Season 2 by Captain Christopher Pike (Anson Mount), and in Season 3 by Captain Saru (Doug Jones). The protagonist of the series is Michael Burnham (Sonequa Martin-Green), a science specialist who becomes captain of Discovery at the end of the third season. The first season focuses on Discoverys involvement in a war between the United Federation of Planets and the Klingon Empire; later seasons see the Discovery crew fighting a rogue artificial intelligence and, sent into the distant future, trying to reunite a fractured Federation.
Title: List of Star Trek: Discovery episodes
Content:  Star Trek: Discovery is an American television series created by Bryan Fuller and Alex Kurtzman for the streaming service CBS All Access (later rebranded as Paramount+). Launched in 2017, it is the seventh Star Trek series and was the first since Star Trek: Enterprise concluded in 2005. It begins a decade before Star Trek: The Original Series and follows the crew of the USS Discovery. A fourth season was officially ordered in October 2020 and premiered on Paramount+ on November 18, 2021.
Title: Star Trek: Discovery (season 1)
Content:  Star Trek: Discovery premiered at the ArcLight Hollywood on September 19, 2017. The first episode aired in a "preview broadcast" on CBS in the United States on September 24, and was made available for free on CBS All Access along with the second episode (which required an All Access subscription). Subsequent first-run episodes, making up the first chapter of the season, were streamed weekly on All Access through November 5. The second chapter streamed from January 7 to February 11, 2018. CBS Studios International licensed the series to Bell Media for broadcast in Canada, and to Netflix for another 188 countries. In Canada, the premiere was broadcast on September 24, 2017, on both the CTV Television Network and on the specialty channels Space (English) and Z (French) before being streamed on CraveTV, 
Title: Star Trek: Discovery
Content:  was streamed weekly on All Access, ending in February 2018. The 14-episode second season was released on All Access from January to April 2019, and the 13-episode third season ran from October 2020 to January 2021. The fourth season premiered on Paramount+ on November 18, 2021, and Pluto TV Europe on November 26 after repurchasing international streaming rights. The series' release led to record subscriptions for All Access, and positive reviews from critics who have highlighted Martin-Green's performance. It has received several accolades, including winning a Primetime Creative Arts Emmy Award. The series began an expansion of the Star Trek franchise by CBS and Kurtzman, leading to multiple other series being produced. These include the companion series Star Trek: Short Treks and the spin-off series Star Trek: Strange New Worlds.
Title: Star Trek
Content:  Star Trek: Discovery is the first series of the streaming television Star Trek revival; it begins as a prequel to the Original Series, set roughly ten years prior. It premiered September 24, 2017 in the United States and Canada on CBS. The series is shown on Paramount+ in the United States; elsewhere, Netflix distributes the series worldwide, except for Canada. The cast includes: • Sonequa Martin-Green as Michael Burnham • Doug Jones as Saru • Anthony Rapp as Paul Stamets • Mary Wiseman as Sylvia Tilly • Wilson Cruz as Hugh Culber • Shazad Latif as Ash Tyler / Voq • Jason Isaacs as Gabriel Lorca • Anson Mount as Christopher Pike Discovery is a serialized drama in which each season follows a single overarching narrative. In a departure from previous Star Trek series, the primary protagonist, Michael Burnham (portrayed by Martin-Green), is not the captain of the titular ship for most of the series. The first season follows a war between the United Federation of Planets and the Klingon Empire, instigated by Burnham, who is court-martialed, demoted, and assigned to the starship Discovery; later seasons follow the crew of Discovery on other adventures.
Title: Star Trek: Discovery
Content:  Star Trek: Discovery is an American television series created by Bryan Fuller and Alex Kurtzman for the streaming service CBS All Access (later rebranded as Paramount+). Premiering in 2017, it is the seventh Star Trek series and was the first since Star Trek: Enterprise concluded in 2005. It begins a decade before Star Trek: The Original Series and follows the crew of the USS Discovery. Sonequa Martin-Green stars as Michael Burnham, a science specialist on Discovery who eventually becomes captain. Doug Jones, Shazad Latif, Anthony Rapp, Mary Wiseman, Jason Isaacs, Wilson Cruz, Anson Mount, David Ajala, Rachael Ancheril, Blu del Barrio, and Ian Alexander also star. The series was announced in November 2015, with Fuller set as showrunner. He left due to creative differences with CBS and was replaced by Gretchen 
Title: Star Trek: Discovery (season 1)
Content:  The first season of the American television series Star Trek: Discovery is set a decade before the events of Star Trek: The Original Series and follows the crew of the USS Discovery during the Federation–Klingon war. The season was produced by CBS Television Studios in association with Secret Hideout, Roddenberry Entertainment, and Living Dead Guy Productions, with Gretchen J. Berg and Aaron Harberts serving as showrunners, and Akiva Goldsman providing producing support. Sonequa Martin-Green stars as Michael Burnham, first officer of the USS Shenzhou and later the Discovery, along with Doug Jones, Shazad Latif, Anthony Rapp, Mary Wiseman, and Jason Isaacs. The new series was announced in November 2015, and Bryan 
Title: Star Trek: Discovery
Content:  On November 2, 2015, CBS announced a new Star Trek television series to premiere in January 2017, "on the heels" of the 50th anniversary of Star Trek: The Original Series in 2016. This was the first Star Trek series since Star Trek: Enterprise concluded in 2005, and the first show to be developed specifically for the CBS All Access streaming service. Alex Kurtzman, co-writer of the films Star Trek (2009) and Star Trek Into Darkness (2013), and Heather Kadin were set as executive producers on the series, which would not be related to the 2016 film Star Trek Beyond. The January 2017 date was 
Title: Star Trek: Discovery (season 2)
Content:  The season premiered on January 17, 2019 on CBS All Access in the United States. It was broadcast in Canada by Bell Media, on specialty channels Space (English) and Z (French) before streaming on Crave. Netflix released each episode of the season for streaming in another 188 countries, within 24 hours of its U.S. debut. The episode "The Sound of Thunder" was made available to stream for free on CBS.com, StarTrek.com, and PlutoTV for a week beginning June 17, 2020, as part of a CBS All Access event titled #StarTrekUnited. The episode was among 15 of the "most culturally relevant" 
Title: Star Trek: Discovery (season 1)
Content:  Hollywood, before debuting on CBS on September 24. The premiere episode was also made available on the streaming service CBS All Access. The rest of the 15-episode season was released weekly on All Access in two chapters, with the first ending on November 12 and the second releasing from January 7 to February 11, 2018. The season's release led to record subscriptions for All Access, and generally positive reviews from critics who highlighted Martin-Green's performance, the series' production values, and its new additions to Star Trek canon. Some criticized the season's writing, particularly the season's structure and how its many subplots were handled. A second season was ordered in October 2017.

Question: when does star trek discovery air on tv?
Answer: September 19, 2017.