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To be honest, almost no one expected Martha—quiet, brave Martha Jones, also a doctor, but a real one—to step between the Doctor and the Dalek's death ray, and absolutely no one expected her to do it with a smile on her face.
The Doctor rocks her in his arms, looking truly devastated. Martha tries to smile at him through her pain, but she's aware it probably comes out as a grimace. "Cheer up—Doctor," she gasps, wincing as something she recognises from long ago starts to burn through her broken body. "It's not—over yet."
"Oh, Martha, I wish it wasn't, I really do—" The Doctor stops, staring at the yellow glow that is now suffusing through Martha's dark skin. "What?"
Martha laughs, and with effort she half-pushes, half-rolls away from the Doctor. He slowly backs off, still staring. "I thought I'd never have to tell you," she says to him, pushing herself to a sitting position and watching her own hands pulse with golden light. "But don't worry, Doctor. Because I know. I know everything, now."
"Know what?" the Doctor demands, both frightened and expectant. "Martha Jones, who are you?"
"I don't know the answer to that just yet, Doctor, but I do know this." Martha flings her arms out to the side and yells to the skies, just before her regeneration begins, "You'll never be alone!"