Osgood – Ingrid Oliver
Kate – Jemma Redgrave
Jac – Jaye Griffiths
Claudette – Cleopatra Dickens
Jemima – Sasha Dickens
Walsh – Rebecca Front
Little Boy – Abhishek Singh
Little Boy’s Mum – Samila Kularatne
Hitchley – Todd Kramer
Lisa (Drone Op) – Jill Winternitz
Norlander – Gretchen Egolf
Hitchley’s Mom – Karen Mann
Walsh’s Son – James Bailey
Zygons – Aidan Cook, Tom Wilton
Voice of the Zygons – Nicholas Briggs
General production staff
Head of Production – Gordon Ronald
Line Producer – Tracie Simpson
Production Manager – Steffan Morris
Location Manager – Nick Clark
Unit Manager – Iestyn Hampson-Jones
Production Co-ordinator – Adam Knopf
Assistant Production Co-ordinator – Sandra Cosfeld
Production Assistants – Si├┤n Crowle, Jamie Shaw
Unit Medic – Glyn Evans
Production Accountant – Simon Wheeler
Assistant Accountant – Justine Wooff
Camera and lighting department
1st Assistant Director – Dan Mumford
2nd Assistant Director – James DeHaviland
3rd Assistant Director – Danielle Richards
Assistant Directors – Chris Thomas, Gareth Jones
Script Supervisor – Steve Walker
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 – Bob Milton, Gareth Sheldon, Gawain Nash, Rob Fernandes, Andrew Williams
Art department
Supervising Art Director – Dafydd Shurmer
Art Department Accountant – Bethan Griffiths
Production Buyers – Julian Luxton, Linda Morgan
Set Decorator – Adrian Anscombe
Prop Buyers – May Johnson, Vicki Male
Concept Artist – Chris Lees
Graphic Artist – Matthew Clark
Motion Graphics – Daniel Lazenby
Standby Props – Liam Collins
Standby Carpenter – Paul Jones
Prop Hands – Ian Davies, Scott Howe, Nigel Magni, Matt Watts
Standby Art Director – Julia Challis
Rigging – Shadow Scaffolding
Head Scenic Artist – Clive Clarke
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
Construction Manager – Terry Horle
Construction Chargehand – Dean Tucker
Construction Driver – Jonathan Tylke
Construction Labourer – Mike Cox
Practical Electricians – Christian Davies, Austin Curtis
Draughtspersons – Julia Jones, Kartik Nager
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, Dani Biernat
Casting
Casting Associate – Alice Purser
General post-production staff
Post-production Supervisor – Samantha Price
Post-production Co-ordinator – Hannah Jones
Assistant Editors – Becky Trotman, Robbie Gibbon
On-line Editor – Mark Hardyman
Assistant On-line Editor – Christine Kelly
Special and visual effects
VFX Editor – Dan Rawlings
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
A fragile peace between humans and Zygons begins to collapse as a faction of Zygons seeks control. Clara is replaced by a Zygon duplicate, while the Doctor and UNIT attempt to contain the crisis. The situation escalates toward war, with both sides preparing for violent confrontation.
A faction of shape shifting Zygons begins a coordinated takeover of Earth by replacing humans, including members of UNIT.
Clara Oswald is kidnapped and replaced by a Zygon duplicate, escalating tensions between humans and Zygons.
Osgood is a UNIT scientist who acts as a bridge between humans and Zygons, representing peaceful coexistence.
The Doctor tries to maintain peace while preventing full scale war, using negotiation and psychological strategy rather than force.
The episode focuses on identity, trust, and the dangers of prejudice and escalation in conflict.