The central column stopped moving and the Doctor looked directly at Jon. "Are you absolutely sure you want to go here?" he asked. "Skaro can be a very dangerous place ... for obvious reasons." Skaro was the homeworld of the Daleks, the Doctor's most fearsome enemy.
"Yes, I'm sure. I want to actually go to the places I've seen from the TV show."
"Then wouldn't you rather go somewhere a bit ... safer? The Medusa Cascade, for example. Or perhaps the Eye of Orion? Or New Earth?"
"No, I want to see Skaro."
The Doctor sighed, then said "Skaro it is, then." He walked around the control console and towards the exit. He turned and saw that Karyn and Jon were still standing there. "Well, come along."
Jon and Karyn followed the Doctor out of the TARDIS and onto an actual real-life alien world. They looked around with awe, while the Doctor looked around with careful consideration.