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The Doctor peers at the scanner. "Yep, you're definitely Gessurian."
"With some human mixed in," Jack adds. "Sorry."
"No! I can't be! What about food?"
"Ah, anything high in iron would do you. They actually have supplements these days that–"
"I'm over one hundred!"
Jack looks at the Doctor. Both bite back laughter.
The Gessurian growls. "I'm not an alien. I'm a vampire!"
The Doctor's face softens and his eyes shine with pity. "I'm sorry. I'm so sorry you had to find out this way, Edward. But really, you could have worked it out before – real vampires don't sparkle."