Liverpool Sound and Vision Rating * * * * *

Cast: Peter Capaldi, Jenna Coleman, Michelle Gomez, Julian Bleach, Jami Reid-Quarrell, Joey Price, Nicholas Briggs, Barnaby Edwards, Nicholas Pegg.

Two-part stories within the world of Doctor Who have a habit of being lost in the storm, the build up can be a let-down or the finale such a disappointment that the whole structure of the tale becomes a series of woes and misbegotten anecdotes struggling to breathe in the weight of expectation.