The 580th episode of Doctor Who airs on BBC1. Leonard Sachs and Michael Gough guest star; for the first and only time to date in the series, the next actor to play the Doctor appears in a small guest role (Colin Baker). This episode is the beginning of the 20th anniversary season of Doctor Who, and brings back Omega, the villain of 1973’s The Three Doctors, in a story set on the Time Lord planet of Gallifrey.
Doctor Who: Arc Of Infinity, Part 1
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