The plot revolves around a group of guerrillas from the 22nd century who have travelled back to the 20th century in an attempt to kill the man they believe is responsible for the Daleks conquering the Earth. The Doctor is sent by U.NI.T. to investigate. I can't help but think that James Cameron might have seen this prior to coming up with the idea for The Terminator.
This may seem like heresy to hardcore classic Who fans, but I really like the special edition version, the new effects don't look out of place, and the new Dalek voices make a huge difference to the atmosphere of the story. For those who can't bear tinkering with the classics, you still have the original version on disc one.
In terms of extras, as usual 2 Entertain have put in lots of interesting content including the aforementioned 'The Cheating Memory' (nice title), part two of 'The U.N.I.T. Family', 'Now and Then' looking at locations used for the story, the very entertaining Toby Hadoke presents 'The U.N.I.T. Dating Conundrum', 'Blasting The Past' a making of documentary, along with a making of documentary for the special edition, as well as 'A View From The Gallery', and clips from Blue Peter and Nationwide, production subtitles and a commentary from Anna Barry, Jimmy Winston, Barry Letts, Terrance Dicks and Mike Catherwood.
If you are after a classic Who DVD to add to your collection this is a must.