Mankind looks to the stars because of Clara’s disregard for democracy, but you can’t make a human space exploration omelette without cracking a few moon eggs.
Coal Hill School’s premier disruptive influence Courtney Woods has made the Doctor her latest excuse for tearaway behaviour, so he makes a special case of her and takes her to the moon, but 35 years in the future for some reason.
They land on an exhibit borrowed back from the Smithsonian, carrying Earth’s remaining nuclear stockpile and about to make a Deep Impact into the lunar surface, because they’re crash-landing for some reason.
And just what are those bombs for? Some reason?
Armageddon to that! The unusually gravid moon is not what it seems. But just when Clara’s seeking a friend for the end of the world, our favourite prat climbs back into the TARDIS and leaves humanity to determine its own future, for some reason. Meteor what?
And, as discussed, a moon size comparison, which in hindsight actually looks like the exact same moon model, only rendered smaller: