England, the near future. A strange anti-matter creature arrives on Earth and attacks UNIT HQ. It seems to be specifically seeking the Doctor out - but why? With the Time Lords themselves unable to help, it seems the only person who can help the Doctor is himself - or selves...
- Writer
- Bob Baker, Dave Martin
- Director
- Lennie Mayne
- Cast
- Jon Pertwee, Katy Manning
- Guest Stars
- William Hartnell, Patrick Troughton, John Levene, Rex Robinson, Roy Purcell, Clyde Pollitt, Graham Leaman, Patricia Prior, Denys Palmer, Nicholas Courtney, John Scott Martin, Laurie Webb

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