"Planet of the Dead" is the second of five special episodes of the British science fiction television series Doctor Who broadcast between Christmas 2008 and New Years Day 2010. It was simultaneously broadcast on BBC One and BBC HD on 11 April 2009. The specials served as lead actor David Tennant's denouement as the Tenth Doctor. He is joined in the episode by actress Michelle Ryan, who plays Lady Christina de Souza, a one-off companion to the Doctor.