John Hurt
From Tardis Wiki, the free Doctor Who reference
John Hurt is a human actor. He appeared in a film titled Alien. A memorable scene involved an alien creature bursting out of his character's chest. Toshiko Sato compared the body of a dead soldier with his heart ripped out to "that bit in Alien where that thing bursts out of John Hurt." (TV: Greeks Bearing Gifts)
He will play a lost incarnation of the Doctor in the 50th Anniversary Special as confirmed by the the Series 7 Finale, The Name of the Doctor.