Liverpool Sound and Vision Rating * * *

Cast: Tom Baker, Louise Jameson, David Selby, Michael Felton Stevens, Hywel Morgan, Clive Mantle, Christine Roberts, Ian Hallard.

There is a new villain in town, Earth and its associated planets are under threat from a despicable evil and only one man can save them, one man, a savage of impeccable understanding and loyalty and a strange Blue Box who never takes the Doctor where he wants to go but always where he is needed.