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Gliese 581d was the destination of a colony ship that the Fourth Doctor, Romana II and K9 Mark II encountered. (PROSE: All Snug in Their Beds)
Behind the scenes
- In real life, Gliese 581 D is a possible extrasolar planet that could potentially be habitable.
- During the time of the 2017 episode Smile, Gliese 581d is given as the name of the planet being visited in the story, on BBC Doctor Who website,[1][2][3] and is named as such by the interviewer of the story's writer Frank Cottrell-Boyce in DWM 512 - though not by Cottrell-Boyce himself.