The Doctor looked after the car and realized it was a pretty normal car. Which was odd, because she would assume if this were an alien planet, it would be different. Then she looked at Tony. "Different dimension. Still Earth. Pretty sure we're on Earth." She dodged a two-headed bird on the street and then stopped. "Well, maybe."
Tony was pointing to a large building as the Doctor tracked the bird with her eyes. She really wanted to scan it. Or pet it. But Tony was right. The building looked interesting, and it would make sense to investigate. She walked up beside him and nodded. "Let's go!"
Stepping forward as always, she started towards the building, at least checking before she crossed the streets this time. The whole time, she was smiling widely and looking back at him when she talked. "Haven't had an adventure like this in a while. Alien planet- sort of. Always fun to learn about new species, don't you think??"