Matt Smith
The Doctor
Jenna Coleman
Clara Oswin Oswald
Richard E. Grant
Dr. Walter Simeon
Dan Starkey
Strax
Catrin Stewart
Jenny Flint
Neve McIntosh
Madame Vastra
Tom Ward
Captain Latimer
Liz White
Alice
Joseph Darcey-Alden
Digby Latimer
Ellie Darcey-Alden
Francesca Latimer
Ian McKellen
The Great Intelligence (voice)
Juliet Cadzow
Ice Governess (voice)
Jim Conway
Uncle Josh
Cameron Strefford
Young Walter
Annabelle Dowler
Walter's Mother
Ben Addis
Bob Chilcott
Daniel Hyde
Lead Worker
Sophie Miller-Sheen
Girl