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

Saul Metzstein