Jack couldn't help but stare. It might not be Donna but it was... something. She looked like Donna, she sounded like Donna. Jack hardly knew her but this... The only reason he was sure it was an illusion is that he told himself it was.

"Exactly," he said, stepping in front of the Doctor, a hand on his shoulder. He tried to apply more confidence than he felt. "Mind games, right? Just a mirage, that's all. Donna's at home, probably having an argument with someone over the latest episode of Eastenders, right?"