10. The T-Rex Attacks Episode 1
BBCIts this kind of moment when Doctor Who is at its best. The times when whoevers writing an episode just says sod it, takes a mad idea, and runs with it. A tyrannosaurus rex rampaging around Victorian London is a concept as utterly bizarre as something like Sharknado, but for Doctor Who, it works. Theres a madness and lack of logic to it but its one that makes perfect sense for a programme so wonderfully bonkers. Its also an excellent scenario in which to place the Doctor in the immediate aftermath of a Regeneration (especially one that shouldnt be scientifically possible) because it wont allow him to have the occasional slow moment to get his bearings. A dinosaur attacking London is a situation where time is of the essence and not acting quickly enough could cost lives. Which is the perfect kind of difficult problem for a Regeneration-addled Doctor to face. Theres also an opportunity for some good comedic scenes at the same time as fast-paced action. Strax trying to single-handedly kill a dinosaur the size of Big Ben would be a golden comedy moment.