The 2011 Doctor Who story – Life on Mars co-creator Graham’s first since 2006′s Fear Her – has also been confirmed to feature Life on Mars and Ashes to Ashes actor Marshall Lancaster as well as Sarah Smart.
Leon Vickers may be familiar to viewers from an episode of Garrow’s Law, and he is set to appear with former Torchwood star Burn Gorman (Owen Harper) this year in the movie Laid Off. Mark Bonnar meanwhile has been seen in BBC One’s Casualty.
Vickers, who is believed to be playing a character named ‘Clone Worker’ in the two-parter, previously appeared in an episode of Garrow’s Law and will also appear alongside former Torchwood star Burn Gorman in 2011 film Laid Off.
Steven Moffat has described the episodes as a:
â€œ…thrilling and terrifying two-parter. The Doctor will face a dilemma the like of which heâ€™s never seen before.â€