Terror of the Zygons, Part Four

S13E04·9.4·September 20, 1975·25m·BBC One

UNIT attempt to track down the Zygon ship while Broton prepares to have the Skarasen attack London.

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#2In Season 13of 26 rated episodes

#18All-timeof 700 rated episodes

+0.2vs season avgSeason 13 averages 9.2

1975First airedSeptember 20, 1975

Guest stars

Lillias Walkeras Sister Lamont

Robert Russellas The Caber

John Woodnuttas Duke of Forgill

Keith Ashleyas Zygon

Douglas CamfieldDirector

Robert Banks StewartWriter