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The Doctor is presented with a moral dilemma when Icthar reveals his plans to get rid of the human race so the Silurians can take back what was once theirs.
While the Silurians and Sea Devils attack the bases air locks, the saboteurs take advantage of the distraction to go ahead with their own plans.
The TARDIS arrives in Little Hodcombe, Tegan wants to visit her Grandfather while they are there. Also, a war re-enactment is going on that starts to get more and more out of hand and realistic for unknown reasons.