| "Terra Firma" | |
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| Star Trek: Discovery episodes | |
&sq=Qlik&lang=&file=File:Star_Trek_Discovery_Terra_Firma_poster.jpg) Promotional poster | |
| Episode nos. | Season 3 Episodes 9 and 10 |
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| Editing by | Chad Rubel |
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"Terra Firma" is the ninth and tenth episode of the third season of the American television series Star Trek: Discovery, and the 38th and the 39th episode overall. The two-parter begins in the 32nd Century, and follows Emperor Philippa Georgiou as she returns to the Mirror Universe. The story for both parts was written by Bo Yeon Kim, Erika Lippoldt, and Alan McElroy. The teleplay for the first part was written by McElroy, with Omar Madha directing. The teleplay for the second part was written by Kalinda Vazquez, with Chloe Domont directing.
Special guest star Michelle Yeoh portrays Georgiou alongside series regulars Sonequa Martin-Green, Doug Jones, Anthony Rapp, Mary Wiseman, Wilson Cruz, and David Ajala. The two-part story writes Georgiou out of the series, setting up a potential Section 31-based spin-off series starring Yeoh from writers Kim and Lippoldt. It does this using the Guardian of Forever from Star Trek: The Original Series, with guest star Paul Guilfoyle portraying a personification of the Guardian. The episodes return to the Mirror Universe for the first time since the first season, allowing costume designer Gersha Phillips to make improved costumes for the setting. Filming took place in Toronto, Canada around December 2019, and included location shooting in temperatures below freezing.
The first part was released on the streaming service CBS All Access on December 10, 2020. The second part was released a week later on December 17. Both parts received mixed reviews from critics.