London 1963. The first Doctor is forced to leave Earth, after two teachers from his granddaughter's school discover the TARDIS, disguised as a police box, sitting in a junkyard...

London 1963. The seventh Doctor returns - with new companion Ace in tow and with unfinished business. Not for the first time, unusual events are unfolding at Coal Hill School and at Totters Lane junkyard.

The Doctor discovers that his oldest foes - the Daleks - are on the trail of hidden Time Lord technology. Technology that he himself left behind on Earth all those years ago. The Daleks are planning to perfect their own time-travel capability, in order to unleash themselves across all of time and space. Can the Doctor-with the help of the local military - stop the Daleks stealing the Gallifreyan secrets?
Or are things much more complicated?

Two opposing Oalek factions meet in an explosive confrontation, with the fate of the entire Universe at stake...

This story was broadcast on BBC1, 5th to 26th October 1988.

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