I mean shit, there's like two episodes all year between Christmas and New Hot Doctor, you'd think somebody would have put in some effort. I mean, there are some very sneaky/smart lines and themes that I think reward the paying-attention viewer with a fairly complete picture of how the rest of 2009 is going to go down, but they're placed like gems in a pile of shit and it's like, do you even really want a beautiful shiny gem when it's covered with that?
Anyway, the Rhondium detector was tracking a "hole in the fabric of reality," which grew to a bus-sized size and ate a bus, which was them. He tosses some sand at nothing, and the nothing wobbles, because it's a wormhole and that's what wormholes do when you throw sand at them. Well, that's not true. Certain kinds of wormholes are sand-wobbly, but that's like basic science. The driver goes, "Let's just go back through the hole!" and the Doctor goes, "Don't," so the driver does, and the Doctor gets very Willy Wonka for some reason like, "No Augustus Gloop don't do it come back," but the driver pays no heed and turns into a skeleton as the flesh is burnt off his bones, and the skeleton flops onto the pavement in front of the cops back in London, and one of the helpful interchangeable people awesomely goes, "He was bones, just bones!" Asshole Cop Guy is like, "Call UNIT. That guy was just bones."
The Doctor and Christina and one of the interchangeable people have a short discussion about Faraday cages, because they are smartypantses, and the Doctor technobabbles for no reason in case you were thinking maybe there was not enough metal in this particular bus to serve as a Faraday cage going through the wormhole, like, maybe if you called bullshit on that, the Doctor goes, "Slightly different dynamics with a wormhole. There's enough metal to make it work, I think. I hope." Spotty attempts. It's like if you were staying in a hotel that was on fire, and they're like, "We're so sorry the Pay-Per-View isn't working! Here's a free breakfast voucher." And you're like, "Fuck breakfast, my granddad's on fire," and they're like, "Yes, but he gets a senior discount on breakfast! Just one of our little ways of showing customer appreciation."