Last night’s Doctor Who season premiere had a lot going on. Clara was dealing with a newly regenerated Doctor she’s not sure she can trust. The Paternoster Gang were on hand to help the freshly minted Twelfth Doctor investigate a most peculiar murder. And, most intriguingly, the episode introduced elements that not only hinted at the show’s future, but tied back to some memorable moments from its own past. Needless to say, we’ve got questions…big ones.