Liverpool Sound and Vision Rating 8.5/10

Cast: Peter Capaldi, Jenna Coleman, Colin McFarlane, Sophie Stone, Zaqi Ismail, Morven Christie, Arsher Ali, Steve Robertson, Paul Kaye, Neil Fingleton, Peter Serafinowicz, Corey Taylor.

There are moments in the world of science fiction in which as a viewer, the onlooker into the world of the fantastic and seemingly off kilter from our own perceptions of reality. Where you just know in a darkened corridor or locked basement where writers are kept from the prying eyes of the public and their demands, that the occasional fist bump, high five or even hugging with certain amounts of glee are to take place when they explain themselves out of a possible predicament in a story line. If that is the case then all three signs of exuberant showmanship should have been heard somewhere around the bay of Cardiff as the fourth episode of the 2015 series of Doctor Who played out.