The Doctor faces a hard choice in The Evil of the Daleks

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Dissembling Past these Thorns

"What do you want with Jamie?"

The Doctor's voice was deceptively soft but his blue eyes sparked hard and dangerous. It was an unthinkable game they played, seeking to imbue the Dalek race with elusive, indefinably human factors; taking them on as if merely adopting yet another technological weapon.

I must play along, he thought, dissembling, desperately hoping Jamie's trust would withstand the twist, this duplicitous sham of a betrayal. A cruelty, to force such manipulation of trust.

And yet…

Was it possible? The shining qualities of this young Highlander warming those glacial hearts?

It must at least be tried.