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Logopolis is a serial in the British science fiction television series Doctor Who, which originally aired in four weekly parts from February 28 to March 21, 1981. It was Tom Baker's last story as the Doctor and marks the first appearance of Peter Davison in the role.
Synopsis
The Fourth Doctor is pacing around in the TARDIS cloister, pondering thoughts of decay and entropy. As he and Adric go to leave the room, the large bell in the center of the room begins to ring. This worries the Doctor, as the sound of the cloister bell is a sign of impending universal catastrophe.
To keep his mind off this, he decides to repair the TARDIS's chameleon circuit, which has frozen it into the shape of a police box. In order to do this, he intends to materialise the TARDIS around a real police box (thus disguising it), and then obtain its precise dimensions. With these measurements, he will have the inhabitants of the planet Logopolis produce a mathematical calculation - a block transfer computation - to reset the circuit. However, the "police box" he materialises around is actually the TARDIS of the Master, who has survived their encounter on the planet Traken. When the Doctor materialises around the Master's TARDIS, a recursive loop of TARDISes within TARDISes is formed.
Meanwhile, an airline stewardess, Tegan Jovanka, is being driven to the airport by her Aunt Vanessa. After their car breaks down, Tegan decides to go to the "police box" for help, but finds herself lost in the TARDIS instead. The Doctor and Adric enter another police box in a duplicate TARDIS, but find themselves this time outside the box, and meet a number of policemen. They find the shrunken, dead bodies of Tegan's aunt and another policeman, and think the Doctor has something to do with it. Adric creates a distraction, and allows the Doctor to escape. In the distance, a mysterious white-clad stranger watches the proceedings.
Realising that the shrunken bodies are the trademark of the Master, the Doctor decides to materialise the TARDIS underwater, to literally flush him out. The Doctor misses the River Thames, however, and lands on a boat instead. The mysterious stranger appears here too, and beckons to the Doctor, telling him to go to Logopolis.
As the TARDIS arrives at Logopolis, Tegan finds her way to the control room, somewhat annoyed. She asks to know where her aunt is, and the Doctor, realising that she was the dead woman in the car, skirts the question. Once they exit the TARDIS, the Doctor asks the Logopolitan leader, the Monitor, for his help. The Logopolitans are able to model reality by pure mathematics - whatever they calculate can take physical form. However, block transfer computations cannot be calculated by machines, so to perform them, the Logopolitans do not use computers. Instead, they use a large physical array of Logopolitans, each muttering a line of calculations out loud and passing them on to the next.
However, unknown to the group, the Master has arrived on Logopolis, and has killed several Logopolitans, which disrupts the calculations for the TARDIS. When the Logopolitans produce the required computation and the Doctor attempts to enter it into the TARDIS, it instead shrinks the TARDIS to half its normal size and causes strange effects inside the ship. The Logopolitans try to stabilise the TARDIS using sonic projectors to project a stasis field while the Monitor and Adric attempt to uncover the fault.
Meanwhile, Nyssa has been bought from Traken by the Watcher, the mysterious white figure the Doctor spoke with. She is searching for her father. The Monitor and Adric work through the city and discover the shrunken bodies of three Logopolitans. Correcting the error this has caused, they bring the new computation to the TARDIS. Tegan holds the notes up to the TARDIS so the Doctor is able to read them through the scanner and correct the fault. The Doctor emerges from the now restored TARDIS, and admits to Tegan that her aunt is dead. Meanwhile, Nyssa finds the Master, whom she believes him to be her father as he is inhabiting Tremas's body. The Master gives her a bracelet, which is actually a device which will allow him to control her movements.
The Master attaches a device to the sonic projectors and sets up a counterwave that brings silence to the Central Registry, preventing the Registers from making their calculations. He then goes to the Registry's control room (a replica of the Pharos Project on Earth, a radio telescope tasked to seek out signs of extraterrestrial life), and demands that the Monitor tell him what the true purpose of Logopolis is. The Doctor arrives with Adric and Nyssa, and Adric deactivates the Master's device, only for the Master to have Nyssa attempt to throttle him. Tegan restores the device, and the Master repeats his demand. The Monitor warns the Master that bringing Logopolis to a halt will cause universal disaster, but the Master replies that it is only a temporary effect, which he attempts to demonstrate by deactivating the supression device.
However, the silence persists and the calculations do not resume. They go outside, and find all the Logopolitans dead, crumbling to dust, and the city itself collapsing. The Master thinks this is some sort of trick and tries to have Nyssa strangle the Monitor, but the control device ceases to function. He tries to increase the device's power, but this causes it to fall apart as local decay increases. The Monitor explains the situation: the universe had long ago passed the point of heat death. To stave off final collapse, the Logopolitans had been modelling a number of temporary Charged Vacuum Emboitments, like the one through which the TARDIS had been previously transported into E-Space. The excess entropy generated by the universe had been passing through the CVEs to other universes. However, The Master's interference has caused the CVEs to close and the universe is now dying at last.
Realising that he and the Master must work together, the Doctor orders his companions into his TARDIS, and has the Watcher take them out of spacetime. However, Tegan refuses to co-operate and follows the Doctor, Master and Monitor back to the Logopolis control room. The Monitor reveals that they had been completing a program to make the CVEs permanent, and prepares to use it on one of the surviving CVEs, but entropy takes hold of him and he disintegrates before their eyes. The Doctor dismantles the computer and realises the program is stored in bubble memory that they can use with the real Pharos Project. The Doctor, Master and Tegan escape from Logopolis in the Master's TARDIS.
Adric and Nyssa watch helplessly in the Doctor's TARDIS as a portion of the universe is wiped out by encroaching entropy - including Traken. On Earth, the two Time Lords reconfigure the Logopolitan program and feed it into the Project's computers, but the Master points out that the transmitter is pointed away from the last surviving CVE. As the Watcher brings the Doctor's TARDIS to Earth, the Doctor and the Master run on foot to realign the dish. The Doctor's companions distract the guards and the two Time Lords get to the dish's control room, hooking up a light speed overdrive from the Master's TARDIS to ensure the signal gets to the CVE in time. Upon transmission of the program, the CVE begins stabilising.
The Master's co-operation with the Doctor has been a ploy, however. Holding the Doctor at gunpoint with his Tissue Compression Eliminator, he transmits a message to the people of the universe, saying that if they do not acknowledge his rule, he will send a signal to close the CVE and restart the collapse. The Doctor climbs onto the radio telescope's gantry to disconnect the power cable, and the Master attempts to prevent him by tilting the dish 90 degrees. The Doctor succeeds in disconnecting the cable, but falls off the gantry. As he hangs on to the disconnected cable, visions of old enemies mock him. Losing his grip, the Doctor plunges to the ground. The Master enters his own TARDIS and it dematerialises.
The Doctor's companions run to the spot where he has fallen. Dying, the Doctor experiences visions of the companions that have accompanied his current form and observes, "It's the end... but the moment has been prepared for." They turn to see the Watcher approach, and as he does so he merges with the Doctor. Nyssa realizes that the Watcher was the future Doctor all the time. As the companions look on, the Fourth Doctor regenerates into a new, younger body.
Notes
- The serial was written by Christopher H. Bidmead, and directed by Peter Grimwade.
- Before falling off the dish, the enemies that mock the Doctor are the decaying Master (The Deadly Assassin), a Dalek (Destiny of the Daleks), the Pirate Captain (The Pirate Planet), the Cyberleader, (Revenge of the Cybermen), Davros (Genesis of the Daleks), a Sontaran (The Invasion of Time), a Zygon (Terror of the Zygons) and the Black Guardian (The Armageddon Factor).
- The spin-off BBC Books novel The Quantum Archangel by Craig Hinton briefly shows an alternate timeline where the destruction of Logopolis did result in the death of the universe.
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