With an anti-matter being trying to enter the universe through the Doctor, risking the destruction of everything, there is only one clear course of action for the High Council of Time Lords to take: execute the Doctor. Meanwhile, Tegan arrives in Amsterdam and hear about what's become of her cousin from his unscathed friend.
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Look, Damon, I know you've already risked a great deal for me but could I impose on you a little further?
I need another space/time element for the TARDIS - preferably without a recall circuit.