In the mysterious world of the Nethersphere, plans have been drawn up.
Missy (Michelle Gomez) is about to come face to face with the Doctor, and an impossible choice is looming.
“Death is not an end” promises the sinister organisation known only as 3W – but, as the Doctor and Clara discover, you might wish it was.
Chris Addison also guest stars.
Doctor Who: Dark Water airs on Saturday, 1 November at 8.15pm on BBC One.
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(C) BBC / Jack Barnes
Watch the trailer below…