Written by: Peter Harness Directed by: Daniel Nettheim Guest starring: Rebecca Front, Jaye Griffiths, Cleopatra Dickens, Sasha Dickens, Abhishek Singh, Todd Kramer, Jill Winternitz, Nicholas Asbury, Jack Parker and Aidan Cook Jemma Redgrave will be back (again) as Kate Stewart in this story, too, since she's never been one to miss out on a UNIT party. Unless, you know, she's being thrown head first out of a plane or something. The writer of this two-parter, Peter Harness, has teased that it includes one of the biggest cliffhangers of the series so expect Twitter to go into meltdown after this one. After making his Doctor Who debut in Series 8, fans can rest assured that Peter's latest contribution will be worth the wait. Just don't make the Moon an egg again, all right?