Serial: 7K  Episode Nos. 683, 684, and 685.  Title: Silver Nemesis

On November the 23rd, 1988, a comet called Nemesis launched into space some 350 years earlier by the Doctor returns to the Earth, once again generating destruction in it's wake.  Inside the comet is the statue of Nemesis, formed in the shape of Lady Peinforte, a 17th century witch who travels forward in time with the statue's arrow to seize control of it.  She has competition, however, from a group of South American Nazis in possession of the statue's bow, and from a force of Cybermen who see the statue as the perfect weapon to enable them to transform the Earth into their new base planet...

starring Sylvester McCoy as the Doctor and Sophie Aldred as Ace. Written by Kevin Clarke, Produced by John Nathan-Turner, and Directed by Chris Clough.

Originally transmitted from 23 November 1988 to 7 December 1988 on BBC1.
 

The Making of Doctor Who

Join a crew from PBS station New Jersey Network as they document the production of  Silver Nemesis
from the earliest rehearsals and costume fittings through to actual recording on location.  Includes interviews
with the entire cast and crew.