There are 5 actors from the Dr. Who Universe in this episode from the old and new Dr. Who and Torchwood series.
Kevin McNally plays Gerald Farquaharson in this episode. He previously played the role of Orville Tudway in episode 2.4, Blood Will Out (1999).
Jane Wymark and Kevin McNally appeared together in the original Poldark (1975) as Morwenna Chenoweth and Drake Carne.
Six of the credited actors in this episode have appeared on EastEnders (1985): Daniela Denby-Ashe, Phil Daniels, Matthew Douglas, Henry Garrett, Daniel Llewelyn-Williams, and Chris Wilson.
Teddy Molloy is played by Phil Daniels who is best known for playing Kevin Wicks in EastEnders from 2006-2008.