Peter Capaldi

The Doctor

Matt Lucas

Nardole

Justin Chatwin

Grant

Charity Wakefield

Lucy

Tomiwa Edun

Mr. Brock

Aleksandar Jovanović

Dr. Sim

Logan Hoffman

Young Grant

Daniel Lorente

Teen Grant

Sandra Teles

Reporter

Tanroh Ishida

Operator

Vaughn Johseph

Soldier