First broadcast in September and October 1975, this four-parter is more than a little reminiscent of Doctor Jekyll and Mr Hyde and sees the Fourth Doctor and Sarah Jane Smith (Tom Baker and Elisabeth Sladen) travelling to the edge of the universe to help a stricken scientific expedition, only to find themselves battling an extremely annoyed creature made entirely of antimatter. Made at the height of the popular Philip Hinchcliffe era, it will be a welcome addition to the Who DVDs.

Estimated despatch 5-10 days after ordering.