Arc of Infinity is the first serial of the 20th season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 3 to 12 January 1983.
On Gallifrey, the Fifth Doctor’s home planet, a Time Lord traitor steals the bio-data code of another Time Lord and provides it to the Renegade, a creature composed of antimatter. The High Council of the Time Lords issue a Warrant of Termination on the Doctor to ensure the Renegade can no longer bond with him. The Doctor is taken for execution, despite Nyssa’s attempts to save him, and placed in a dispersal chamber.
Unbeknownst to the High Council, The Doctor’s mind has been taken into the Matrix, the repository of all Time Lord knowledge, while his body is hidden. The Renegade, who demands an opportunity to return to the Universe it once inhabited, contacts him. The truth of the aborted execution is discovered by the Castellan, who tells Nyssa, Damon, and the High Council that the Doctor is alive.
In Amsterdam, the Doctor’s former companion Tegan is looking for her cousin Colin Frazer. She is greeted by his friend Robin Stuart, who explains that Colin disappeared while they were crashing in the crypt of the Frankendael mansion. The Renegade, which has established its base at the Frankendael, finds them and uses Tegan as bait to force the Doctor to obey him. The Doctor is returned to normal space on Gallifrey where he makes for the High Council Chamber.
Time Lord Councillor Hedin is revealed as the traitor who transmitted the bio-data. Hedin is in awe of his master Omega, first of the Time Lords and pioneer of time travel. Hedin wishes to release Omega from his exile in a universe of antimatter, not realising the great Time Lord has been driven insane by his years of solitary confinement. The Castellan kills Councillor Hedin, but this does not prevent Omega using the Arc of Infinity to seize total control of the Matrix and come to Earth. When he peels his decayed mask away, he reveals the features of the Doctor, whom he now perfectly resembles.
Omega leaves for Amsterdam with the Doctor and Nyssa in pursuit. Within a short time, the Doctor’s prediction of an unstable transfer begins to come true: Omega’s flesh decays and it is clear his new body is not permanent.
When the Doctor and Nyssa catch up with him, it is a painful task for the Doctor to use the Ergon’s antimatter converter on Omega, expelling him back to his own universe of antimatter. The Time Lord High Council on Gallifrey detects the end of the threat. Once Tegan has checked on her cousin’s progress in hospital, she decides to rejoin the TARDIS crew.
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To view the list of other Doctor Who serials, please click this link
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