Moran – Colin McFarlane
Cass – Sophie Stone
Lunn – Zaqi Ismail
O’Donnell – Morven Christie
Bennett – Arsher Ali
Pritchard – Steven Robertson
Prentis – Paul Kaye
General production staff
Production Executive – Gordon Ronald
Line Producer – Tracie Simpson
Production Manager – James DeHaviland
Location Manager – Nick Clark
Unit Manager – Iestyn Hampson-Jones
Production Co-ordinator – Adam Knopf
Assistant Production Co-ordinator – Sandra Cosfeld
Production Assistants – Hannah Jones, Jamie Shaw
Unit Drivers – Sean Evans, Kyle Davies
Unit Medic – Glyn Evans
Production Accountant – Ceredig Parry
Assistant Accountant – Justine Wooff
BSL Monitor – Jean St. Clair
Camera and lighting department
1st Assistant Director – Scott Bates
2nd Assistant Director – Danielle Richards
3rd Assistant Director – Gareth Jones
Assistant Directors – Chris Thomas, Nick Goolding
Script Supervisor – Nicki Coles
Camera Operator – Mark McQuoid
Focus Pullers – Jonathan Vidgen, Steve Rees
Grip – John Robinson
Assistant Grip – Sean Cronin
Camera Assistants – Cai Thompson, Matthew Lepper, Scott Waller
Gaffer – Mark Hutchings
Best Boy – Andrew Gardiner
Electricians – Andrew Williams, Bob Milton, Gareth Sheldon, Gawain Nash, Matt Wilson
Art department
Supervising Art Director – Tristan Peatfield
Art Department Accountant – Bethan Griffiths
Production Buyer – Sarah Frere
Set Decorator – Adrian Anscombe
Prop Buyers – May Johnson, Vicki Male
Storyboard Artist – Mike Collins
Concept Artist – Chris Lees
Graphic Artist – Matthew Clark
Standby Props – Liam Collins, Ian Davies
Standby Carpenter – Paul Jones
Prop Hands – Scott Howe, Nigel Magni, Matt Watts
Standby Art Director – Nick Murray
Rigging – Shadow Scaffolding
Head Scenic Artist – Clive Clarke
Scenic Painters – Steve Nelms, Matt Weston, Paul Murray
Storeman – Jamie Southcott
Prop Master – Paul Smith
Props Chargehand – Kyle Belmont
Props Driver – Gareth Fox
Props Makers – Alan Hardy, Jamie Thomas, Paul Lynch, Jamie Farrell
Construction Manager – Terry Horle
Construction Chargehand – Dean Tucker
Construction Driver – Jonathan Tylke
Practical Electricians – Christian Davies, Austin Curtis
Draughtpersons – Kartik Nagar, Ursula Marshall
Chargehand Carpenter – John Sinnott
Carpenters – Tim Burke, Lawrie Ferry, Matt Ferry, Chris Daniels, Julian Tucker, George Rees, Dan Berrow, Keith Richards, Campbell Fraser
Title Concept – Billy Hanshaw
Costume department
Costume Supervisor – Simon Marks
Assistant Costume Designer – Georgie Sayer
Costume Assistants – Andie Mear, Ian Fowler, Jenny Tindle
Make-up and prosthetics
Make-up Supervisor – Sara Angharad
Make-up Artists – Megan Bowes, James Spinks
Movement
Stunt Co-ordinators – Crispin Layfield, Gordon Seed, Jo McLaren
Stunt Performer – Matt Crook
Choreographer – Ailsa Berk
Casting
Casting Associate – Alice Purser
General post-production staff
Post-production Supervisor – Nerys Davies
Post-production Co-ordinator – Samantha Price
Assistant Editor – Becky Trotman
On-line Editor – Geraint Pari Huws
Special and visual effects
VFX Editor – Dan Rawlings
Special Creature Effects & Prosthetics – Millennium FX
Colourist – Gareth Spensley
Sound
Sound Recordist – Deian Ll┼╖r Humphreys
Dubbing Mixer – Mark Ferda
Sound Maintenance Engineers – Tam Shoring, Christopher Goding
Dialogue Editor – Darran Clement
ADR Editor – Matthew Cox
Effects Editor – Harry Barnes
Foley Editor – Jamie Talbutt
Foley Artist – Julie Ankerson
The TARDIS arrives at an underwater base where a crew is haunted by ghostly figures of their dead colleagues. The Doctor investigates the source, discovering alien symbols and a mysterious signal. When he apparently dies, Clara must take charge. The episode introduces a bootstrap paradox and sets up a deeper mystery about the nature of the ghosts and their purpose.
The Doctor and Clara arrive at an underwater base where a crew is being hunted by ghostly figures after discovering a mysterious alien spacecraft.
The ghosts are revealed to be the transformed bodies of the crew, controlled by an alien signal to spread a message.
The ship is a hearse designed to transport a powerful being known as the Fisher King, whose signal causes the haunting events.
The Doctor treats it like a puzzle, using logic and observation to understand the rules behind the ghosts and their appearances.
The episode explores fear, communication, and the unknown, as well as the idea of interpreting signals and messages.
