"Oh, space is quite easy actually. It's the people in it that are complicated. Or rather, complex." Oh yes, he found it good to be talking to a Rose again. She may not have been his Rose, but she was Rose and that was enough even if it was just for a short while. "I'm exactly me! I'm just not him. Not really any way. Just like he's not me but he is. It's all very complicated when you start to dissect it."
"And you know.. it wouldn't be the first time that I met me." The Doctor says with a faint smile full of memories. "Well, they were me before.. but still me. You should ask me about them some time. Well, him rather."
The kitten slid back into the pocket from surprise at the attention, but quickly composed herself as the Doctor plucked her out and began to show her off. "Her? This is my doctor. Doctor Martha Jones. Oh yes, she's been traveling with me for awhile now. There was.. ahem.. an incident. Now she's a kitten. Still trying to find a way to fix that." MarthaKitten rolled her little kitten eyes and let out a tiny yet bored yawn. "Don't let that look fool you." He grinned and the kitten swatted at him with her paw before he set her on his shoulder. "Brilliant isn't she?"