The BBC have now confirmed that the fourth episode of the current series of Doctor Who, The Power of Three, will be broadcast on BBC1 at 7:30pm on Saturday 22nd September. As in previous weeks, the episode will face competition on ITV1 from Red or Black? and The X Factor; on the other main channels, BBC2 continues its run of Dad's Army, Channel 4 launch a new dating game show called Baggage, whilst Channel 5 travels to the wild west in the film Maverick.

Three images have been released to promote the episode, which also features guest star Jemma Redgrave who plays the role of Kate Stewart. A variety of additional new images will be revealed next week.

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