Richard E. Grant

The Doctor (voice)

Sophie Okonedo

Alison Cheney (voice)

Conor Moloney

Greaves (voice)

Diana Quick

Prime (voice)

Derek Jacobi

The Master (voice)

Craig Kelly

Joe (voice)

Andrew Dunn

Max (voice)

Anna Calder-Marshall

Mathilda Pierce (voice)

Ben Morrison

McGrath (voice)

David Tennant

Young Custodian (voice) (uncredited)

Paul Cornell