"If Dr Who uses his Tardis once more he will be at the mercy of the Daleks!"

The Planet of the Daleks - Episode One

Welcome to the prophetically titled opening installment of the 1972 sequel to Sub Zero, which is the 2nd adventure in the Countdown/TV Action Dalek trilogy. In this episode, the Daleks, furious at their recent defeat in Sydney by the Doctor, plan to track and capture the Tardis using a device they refer to as the "Time Vector" the next time the Doctor takes flight. Meanwhile, on Earth, a member of a group of scientists visiting the Doctor in his cottage turns out to be an imposter who also has intentions on the Doctor's old Police Box...