-Still really don’t get why the Doctor took this oath to become a prisoner on Earth. Was it the only way he could get the Master/Mistress to stay inside the Vault?
Hmmm… The Doctor and the Master are brothers[*], and this episode was all about sacrifice to look after family.
[*] Or so the Doctor Who podcasts say, based on strong (but circumstantial) evidence.
ETA: I didn’t recognize Poirot until the credits.
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