The more she watches him move about and hears him talk, the more unsettled he is. If she didn't know any better, she'd say he's the Doctor. But he can't be, his chin isn't anywhere near big enough. Still, she watches him with eyes that steadily grow wider and wider as her suspicions as to what his identity is grow. And then, he goes and mentions three billion planets and trans-dimensional travel and she's left with her jaw dropped as she stares over at him.

"You - " She tries to be accusing, but she can only sound filled with disbelief.

"You're him, aren't you." She moves in close enough to him that she's in his personal space, and tries to look up into his eyes. "You must be." The eyes aren't the same color, but there's a look there that makes her frown in concern because it's so painfully familiar.

"Doctor?" His name comes out softly, her voice breaking a little. She doesn't know how this could possibly be him, but his behavior is so erratic and the way he talks make her feel like it couldn't be anyone else but him.