Malcolm wasn't on the bus! But yeah, I can see how he could seem kinda annoying (even I was a little peeved with him when he was going mano a womano with Magambo over closing the wormhole, because SERIOUSLY GREATER GOOD AND ALL). STILL HE WAS ADORABLE

I do agree about Christina: while I liked her as a companion, her whole "I deprive the country of priceless things for the adventure!" was kind of ridic. Also her whole "ewww I have dead people in my hair" moment irritated me a lot more than I felt it should. I did like her selfish-slash-practical streak though; we haven't had a really amoral companion since the one-episode wonder Adam back in NuWho S1.

Yeah, I kind of was surprised and thinking that she might actually get taken away to prison, show the kiddies a lesson (just because you're cool, doesn't mean that stealing isn't wrong and you won't get PRISON-RAPED); still, I was kinda glad she got to escape in her flying bus, since she was kinda bad-ass and sassy. Anyone who manages to boss around the Doctor I am ultimately gonna find pretty awesome.

I would ask why they have to give David Tennant sexual tension with every one of his companions (even Jack and Mickey!) but I think it's just something innate in either the actor or the character; I kind of think the former, since I bet he could have sexual chemistry with a piece of wood like John Barrowman.