Doctor Who (2005– )
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The Haereticum holds an ancient book known only as The Veritas. Throughout history, anyone who has ever read it has immediately taken their own life. When a new translation is online, ... See full summary »


Daniel Nettheim


Steven Moffat




Episode cast overview:
Peter Capaldi ... The Doctor
Pearl Mackie ... Bill
Matt Lucas ... Nardole
Michelle Gomez ... Missy
Jennifer Hennessy ... Moira
Corrado Invernizzi ... Cardinal Angelo
Joseph Long ... The Pope
Ronke Adekoluejo ... Penny
Ivanno Jeremiah ... Rafando
Francesco Martino ... Piero
Alana Maria ... Pentagon Woman
Laurent Maurel ... Nicolas
Jamie Hill Jamie Hill ... Monk
Tim Bentinck ... Monk (voice)


The Haereticum holds an ancient book known only as The Veritas. Throughout history, anyone who has ever read it has immediately taken their own life. When a new translation is online, spreading danger, the Vatican appeals to the Doctor for help. Will he read The Veritas? But can even the Doctor survive the ultimate truth? Written by Carrie Fong

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TV-PG | See all certifications »

Parents Guide:

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Release Date:

20 May 2017 (USA) See more »

Company Credits

Production Co:

BBC Studios Wales See more »
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Technical Specs


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Did You Know?


The line that the scientist says to Bill and Nardole, "We'll all go together when we go," is from the Tom Lehrer song of the same name. See more »


This episode continues the fallacy that every Pope is Italian. The current Pope, Francis, is Argentinian. The last Italian Pope was Pope John Paul I, who only reigned for a month in 1978 before his death. See more »


Cardinal Angelo: The very center of the Haereticum, home of the Veritas for over a thousand years.
The Doctor: Truth in the heart of heresy.
Cardinal Angelo: And death in the heart of truth.
Nardole: You'd be wizard at writing Christmas crackers, you two.
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References Super Mario Bros. (1986) See more »


Doctor Who Theme
Written by Ron Grainer
Performed by BBC National Orchestra of Wales
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User Reviews

Timely glitches
24 May 2017 | by voyou-703-655350See all my reviews

I don't want to comment when the level of writing is that bad anymore, but I couldn't resist mentioning one tiny little thing that I didn't find in any other review (I even thought all the useful writers of bad reviews had given up when I saw only praise for the amateurish, dreadful Knock Knock.) So here it is.

The Tardis doesn't translate Italian. A glitch, surely, just in time for a pope who doesn't speak English to show up. A secondary effect of this glitch is that the Italian translator, unlike any other alien in the universe including the Pompadour, has a strong non-English accent.

The glitch is very timely indeed, for when usually the Tardis comes near the Vatican's special library (which is not secret, by the way, only restricted, like a bank's vault,) anyone could read any book, in particular today's McGuffin in its forgotten language.

I'll say no more. I can resist laughing about the stupidity of the rest, in particular the VR BS. If it doesn't slap you right in the face, good for you.

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