This is a really action packed episode, as the ghosts start to overwhelm our heroes. Vastra is a fun presence, and it's nice to see Shawna and Cleo reunited with Abby too. Shame Osgood and Cleo have now both been taken. I like that this instalment addresses UNIT's shady actions in eliminating the Silurians in "Doctor Who And The Silurians", as it shows how corrupt that organisation can be on occasion, even if they are effectively "the good guys." And the Floater is a great addition to the Doctor Who canon too, although I'm not sure I fully trust it. It seems a little too been on the idea of killing the Doctor.