The Three Doctors (Doctor Who) the Third Doctor (Jon Pertwee) for help when Omega drains their civilisation's power. The serial opened the tenth anniversary year of the series, and features the first three Doctors all appearing in the same serial. This makes it the first "Doctor Who" story in which an earlier incarnation of the Doctor returns to the show. A superluminal signal is sent to Earth, carrying with it an energy blob that seems intent on capturing the Doctor. The homeworld of the Time Lords is also under siege, their power being drained through a black hole. Trapped themselves, and desperate to send help,
The Ark (Doctor Who) 1998. It was later released on CD with linking narration by Peter Purves. The CD also includes an interview with Peter about this story and his time on "Doctor Who". This CD is available as an Audio Book on the iTunes Store. "The Ark" was released on DVD on 14 February 2011 in region 2, and on 8 March 2011 in Region 1. The Ark (Doctor Who) The Ark is the fifth serial of the third season of the British science fiction television series "Doctor Who", which was first broadcast in four weekly parts from 5 to 26 March 1966.