Smile (in-universe)
From Tardis Wiki, the free Doctor Who reference
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The first two episodes of a new series of Doctor Who had been broadcast by the time a letter from the Twelfth Doctor had been published in an issue of Doctor Who Adventures. They featured the first appearance of the Doctor's then-newest companion, Bill Potts. (PROSE: Dear Readers)
The Twelfth Doctor, Bill and Nardole strolled past books with the titles The Pilot, Smile, Thin Ice, Knock Knock and Oxygen in a library. (TV: A Time For Heroes)
