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“There’s… one more thing you should know,” the Doctor attempts warning Donna, but she’s already inside the TARDIS-
“Why do you have the Prime Minister handcuffed in your spaceship?!” The Doctor grits his teeth.
“I’m under house arrest,” the Master informs her with an air of malice. The Doctor glares at him.
“Don’t go near him,” the Doctor says, then pauses. “Don’t touch anything until I’ve made sure he hasn’t tampered with it.”
Donna gapes.
“Still want to come?”
“Is he dangerous?”
“No more than I am.”
“Then,”—Donna does hesitate but maybe not as long as she should—“absolutely.”