Series: 10

Original Air date:  April 15, 2017

Number Doctor: 12th

Companion(s): Bill Potts and Nardole

Writer(s):   Steven Moffat

Director(s):  Lawrence Gough

Guest Stars:
Jennifer Hennessy as Moira
Stephanie Hyam as Heather

Synopsis: The Doctor agrees to tutor Bill, a would be university student, but a strange puddle and the mysterious disappearance of Bill’s friend interrupt the tutition. Will the Doctor, Bill and Nardole get to the bottom of things? Will the Doctor gain a new companion? And what is the Doctor hiding in the vault…?

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