Back up to: Season 13
4/4 Broton the Zygon warlord intends to use the Skarasen to attack London.
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3/4 The Doctor and Sarah find their way into the Zygon spaceship at the bottom of Loch Ness.
2/4 Sarah is attacked by a Zygon disguised as Harry.
1/4 Something is destroying oil rigs off the coast of Scotland. UNIT investigates!