I loved that Sarah-Jane called him out on it at the end of Journey's End, as well. She's used to the 4th Doctor's almost need for solitude. And that's something I wish they would try again: a Doctor who doesn't want a companion. Sarah-Jane was the only companion the 4th Doctor offered a trip to after he regenerated (save, I guess, him making a point with Harry Sullivan). Leela forces her way in, Romana is forced on him, and Adric was a stowaway. I like that. I think it shows storytelling variety, beyond the "Magic Carpet Ride" Doctor's 9 & 10 were always on about...
Well I think that was just part of RTD's plan to emphasize the magic and wonder of the Doctor Who universe a little more than before, and give it a little bit of a Spielbergian touch. A lot of times in the classic series it seems like everyones just takes all the time travel and alien worlds for granted: "Ho hum, it's another alien world. Can we go now?" lol
I can definitely understand RTD wanting to avoid that at the start. But I agree it's probably time now for a change in the dynamic. I'd love to see Smith's Doctor having to cope with an alien stowaway who just refuses to leave.
