Rose stares at the maniac who insists he's the Doctor. She doesn't want to believe him, but a feeling she can't ignore says that her Doctor won't return. "Jack! Where's Jack?"

The stranger pulls a face. "He's fine. More than fine."

She stands between him and the TARDIS console. "Not moving 'til you tell me where the Doctor is. And Jack."

As if her words conjured him, Jack stumbles through the door. "Rose, something weird is going on-"

The stranger looks at Jack and shudders. He inhales deeply, and releases his breath like a sigh. "You've got no idea."