Tom Riley, star of "Da Vinci's Demons", will appear in Season 8 - starring in an episode written by Mark Gatiss.
Tom’s previous credits include Inspector Lewis, the hit comedy Twenty Twelve and Monroe. He played Dave Beethoven in the BBC’s Freezing, starred opposite David Tennant in St Trinian’s 2: The Legend of Fritton’s Gold and recently won plaudits for his portrayal of Leonardo Da Vinci in Da Vinci’s Demons. Filming on his Doctor Who episode begins soon.
He tweeted earlier: