Full Circle is the third serial of the 18th season of the British
science fiction television series Doctor Who, which was first
broadcast in four weekly parts on BBC1 from 25 October to 15 November
1980.The serial involves the alien time traveller the Fourth Doctor
(Tom Baker) discovering the life cycle of three closely related
species on the planet Alzariusâ€"the humanoid Alzarians, the Marshmen,
and the Marshspidersâ€"coming "full circle". Full Circle is the first
of three loosely connected serials set in another universe to the
Doctor's own known as E-Space and introduces Matthew Waterhouse as the
companion Adric.En route to Gallifrey to return Romana to the High
Council of Time Lords, the TARDIS passes through a strange phenomenon
and ends up in an alternative universe called E-Space. Neither the
Fourth Doctor nor Romana herself can calculate why the TARDIS scanner
shows images of their planet when they have arrived in a verdant
forest. It later emerges they have journeyed to this pocket universe
through a rare space/time phenomenon known as a Charged Vacuum
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