Luke blinked on confusion. "You've been here since the summer? But that's impossible. You've been back home. I saw you this morning." Luke's eyebrows furrowed together as he thought. "Mr. Smith never detected anything different and I couldn't tell something was either. You're my mum. I know you. I'm sure it was you," Luke insisted. "It couldn't have been a shapeshifter or something like that."
Luke felt excitement at the prospect of getting to meet the Doctor and see the TARDIS. Sarah Jane had told him so much about the Time Lord and his ship already.
He listened as Sarah Jane explained about the Doctor, a thought occurring to him. "Maybe when we go back home, we go back to whenever we were taken from with no memory of here. Maybe it's like an experiment of some sort. That would explain why the Doctor doesn't remember and why you haven't been gone at all," he theorized. He wondered if the Doctor would agree with him. "But I won't mention the Daleks to him if you don't want me to. Does he know about me at all? Does the Doctor think the planet is actually psychic? Mr. Smith's never said anything about a planet being able to be psychic before." Another thing occurred to Luke. "Maybe the Doctor can give me some lessons on things like Mr. Smith does." He looked at Sarah Jane hopefully, wondering what she would think.
When Sarah Jane wrapped her arm around him, he grinned. "Just as long as I get my own room," he said back, feeling much more at ease. "If you're from the summer, should I tell you what's happened in the time you've been gone, even though you haven't really been gone at all? Would that mess things up?" He wanted to tell her that he now had a birthday and about Rani too.