Liverpool Sound and Vision Rating * * * *
Cast: Tom Baker, Mary Tamm, John Leeson, Hayley Atwell, David Warner, Toby Hadoke, Jane Slavin, Duncan Wisbey, Nicholas Briggs, Beth Chalmers, John Dorney.
The Earth is in peril once more and The Doctor and Romana are again caught up between aliens and humanity in what could be the end of all sentient life on the planet. However, the aliens are doing what they need to do to survive, there is a bigger villain at large and it seems they control everything, except for time.