Jenna Coleman
Clara Oswin Oswald
Richard E. Grant
Dr. Walter Simeon
Catrin Stewart
Jenny Flint
Neve McIntosh
Madame Vastra
Joseph Darcey-Alden
Digby Latimer
Ellie Darcey-Alden
Francesca Latimer
Ian McKellen
The Great Intelligence (voice)
Juliet Cadzow
Ice Governess (voice)
Cameron Strefford
Young Walter
Annabelle Dowler
Walter's Mother