About Doctor Who Season 0, Episode 9 :

A series of mishaps trigger the Doctor's regeneration cycle, leading to the biggest and most exciting adventure of his lives! Guest Stars: David Tennant, David Morrissey, Dervla Kirwan, Velile Tshabalala, Ruari Mears, Paul Kasey, Edmund Kente, Michael Bertenshaw, Jason Morell, Neil McDermott, Ashley Horne, Tom Langford, Jordan Southwell, Matthew Allick, Nicholas Briggs,