The Doctor, Sarah Jane, and Scorby are trapped in the manor as a possessed Chase stalks them from within, while the gigantic Krynoid prepares to crush them from without. Worse, the alien plant is ready to germinate, spreading its seeds across England.
- Directed by
- Douglas Camfield
- Written by
- Robert Banks Stewart
Guest stars
All episodes — Season 13
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S13 E1Terror of the Zygons (1)
Aug 30, 19757.625 min
Scotland, the near future. Something is smashing oil rigs off the Scottish coast, and UNIT have been called in to investigate. The Brigadier summons the Doctor to Earth to help in the investigation, but it soon becomes clear some kind of al
S13 E2Terror of the Zygons (2)
Sep 6, 19758.125 min
The Zygon traps the Doctor and Sarah Jane in a decompression chamber while Harry is taken to the aliens' underwater ship.
S13 E3Terror of the Zygons (3)
Sep 13, 1975825 min
The Doctor and the Brigadier begin to realise who the Zygon imposters among them are while Sarah Jane discovers a secret tunnel to the underwater ship.
S13 E4Terror of the Zygons (4)
Sep 20, 19757.925 min
UNIT attempt to track down the Zygon ship while Broton prepares to have the Skarasen attack London.
S13 E5Planet of Evil (1)
Sep 27, 19757.625 min
The Doctor and Sarah answer a distress call and find themselves on Zeta Minor, the last planet of the known universe, where a Morestran expedition has gone missing.
S13 E6Planet of Evil (2)
Oct 4, 19757.725 min
The Doctor realises that Zeta Minor lies on the boundary between the universes of matter and anti-matter and something on the planet won't let the Morestrans leave.