10 Doctor Who Moments Peter Capaldi Can't Be Darker Than

6. The Tenth Doctor Makes Sure The Family Live Forever

There's a strong theme in two-parter Human Nature/The Family of Blood of the differences between the Doctor and human beings. Transformed into an ordinary man, with no knowledge of his true identity, the Doctor - or rather John Smith - enjoys a happy life as a boarding school teacher in 1913. Until he is forced to give it all up so the Doctor can come back and defeat the fiendish Family of Blood who are seeking immortality. It is then that we get one of the most vengeful moments in the Doctor's life. Narrated to us by one of the Family - Harry Lloyd's Son of Mine - we are set against the Doctor and encouraged to see him from his enemy's point of view: a terrifying avenger with a black heart. "We wanted to live forever," we are told "So the Doctor made sure that we did." The cruel and unusual punishments the Doctor dishes out include launching one into a supernova, keeping one in suspended animation as a scarecrow and banishing the little daughter of the family into a mirror. We are used to the Doctor killing the enemy as a last attempt but the fury he unleashes here is near unheard of. It is also the expression that David Tennant pulls, a look of resignation, as if to say "I try to stop myself doing this, but you made me" that makes this moment truly chilling. That fury is the true difference between the Doctor and human beings.