When a Nestene Energy Unit is stolen and a radio telescope sabotaged, the Doctor is contacted by a Time Lord who tells him his old rival the Master is responsible.
Did You Know?
The color master tapes of this four-part serial were wiped by the BBC in the 1970s and the BBC only held 16mm black and white telerecordings. The serial remained only in black in white until the 1990s, when the color signal from a domestic NTSC recording was used with the black and white telerecordings to create new color masters on D3 digital tape. See more
I came to warn you. An old acquaintance has arrived on this planet.
Oh, one of our people?
That jackanapes! All he ever does is cause trouble.
Featured in Restoring 'The Aztecs'