Doctor Who (2005) season 10 episode 6
Episode title: Extremis (1)
“The Veritas. The truth. Truth so true you can't live with it. Is that looking into hell... or seeing the light?” Everyone who has ever read the Veritas has been found dead. In a forbidden library at the heart of the Vatican, the pope urges the Doctor to read the ancient text - but can he handle the truth?
