With the saboteur and murderer revealed and arrested, peace should now be restored, but a new threat emerges - a war-monger who's both ready and eager to aggress upon other worlds with a newly manufactured warrior army.
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I'm glad all this has ended so satisfactorily.
If it has ended.
With the arrest of those two, peace is restored.
What the Doctor means is...
Is don't cross your bridges before they're hatched.