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Episode Guide
Arc of Infinity
Production Code: 6E
Season 20, Story Number 124
Written by Johnny Byrne
Directed by Ron Jones
No episode stills are currently available for this story.

Each episode is identified with date of transmission, duration, ratings in millions, and (for 1963-1974 only) archive status.

Part One
03 January 1983 | 24'37" | 7.2
Part Two
04 January 1983 | 24'42" | 7.3
Part Three
11 January 1983 | 24'37" | 6.9
Part Four
12 January 1983 | 24'28" | 7.2
Archive Status: All four episodes exist as PAL 2” colour videotape, always held by the BBC’s Film and Videotape Library.
Peter Davison (The Doctor), Sarah Sutton (Nyssa), Janet Fielding (Tegan Jovanka), Ian Collier (Omega), Leonard Sachs (Lord President Borusa), Michael Gough (Councillor Hedin), Colin Baker (Commander Maxil), Elspet Gray (Chancellor Thalia), Paul Jerricho (The Castellan), Neil Daglish (Damon), Max Harvey (Cardinal Zorac), Andrew Boxer (Robin Stuart), Alastair Cumming (Colin Frazer), John D. Collins (Talor), Malcolm Harvey (The Ergon), Maya Woolfe (Hotel Receptionist), Guy Groen (Second Receptionist)
A conspirator on Gallifrey informs his unknown master that he has made his selection. Because of time, present location and personality, the Doctor has been chosen. The unknown master is pleased with the choice. A physical imprint of bonding is required, and the creature intends to obtain it.

The Doctor is completing some repairs to the TARDIS – adding an audio link on the scanner – when an ethereal force invades the TARDIS. The unknown creature appears to merge with the Doctor, much to Nyssa’s consternation. The Doctor and Nyssa realise that they are near Rondel, the location of a collapsed Q-star which shields anti-matter. This area is otherwise known as the Arc of Infinity.

A TARDIS arrives in a crypt wherein Colin Frazer (Alastair Cumming) and Robin Stewart (Andrew Boxer), two tourists in Amsterdam, have decided to sleep for the night. A creature (Malcolm Harvey) emerges from the TARDIS, which looks like an ornate tomb, and fires a gun at Colin. Colin vanishes screaming.

On Gallifrey, the High Council of Time Lords – President Borusa (Leonard Sachs), The Castellan (Paul Jerricho), Cardinal Zorac (Max Harvey), Chancellor Thalia (Elspet Grey) and Councillor Hedin (Michael Gough) – are told of the recent events. An anti-matter creature has tried to bond with the Doctor. It has partially succeeded and so is still in this universe. Borusa checks with the Matrix but cannot supply any further information. The High Council order the Doctor’s TARDIS brought to the security area on Gallifrey. Commander Maxil (Colin Baker) requests sole access to the ship.

On board the TARDIS, the Doctor notices that the ship has changed course and comments that the recall circuit has been used only twice before.

When the TARDIS arrives on Gallifrey, the Doctor and Nyssa try to find the computer room but are confronted by Maxil. The Doctor is shot, but only stunned. Maxil then removes the main space/time element from the TARDIS, and the Doctor and Nyssa are confined there.

On Earth, meanwhile, Tegan arrives at Schipol Airport in Amsterdam at 10.59 a.m. to meet up with her cousin Colin. She is instead met by Robin who tells her that Colin is missing.

Borusa sentences the Doctor to death to prevent the anti-matter creature from fully bonding with him. Damon (Neil Daglish), a worker in the computer centre whose colleague Talor (John D. Collins) has been killed by the traitor, is suspicious of the Castellan. He and Nyssa approach Councillor Hedin to see if he can help. The Doctor later manages to ask Damon – an old friend of his – if he can get another space/time element for the TARDIS, and Damon builds one.

The Doctor is placed in the termination machine even as the anti-matter creature prepares to bond with him. At the moment of termination, the creature appears in the Doctor’s place. The Doctor finds himself floating in the space-time dimension of the Matrix, where he finally meets the creature – it is Omega (Ian Collier).

Commander Maxil finds that the termination was rigged and that it did not complete. He advises the Castellan, who determines to locate the Doctor.

Robin and Tegan find Colin in a trance-like daze in the crypt, tending some alien equipment. Tegan and Robin are captured by the alien creature that earlier attacked Colin. It fires the gun device at them, causing them to vanish. They come round inside Omega’s TARDIS, where the creature – the Ergon – scans Tegan for future use. In this way Omega discovers that she knows the Doctor. He then uses her to warn the Doctor off interfering with his plans. The Doctor soon reappears in the termination machine on Gallifrey. The Castellan discovers the identity of the Gallifreyan traitor, and summons the High Council to reveal all.

It is revealed that the Lord President’s codes were used to access the Doctor’s bio-scan and also to transmit to Earth a fusion booster element which can convert water into power. However, it is not the President who is the traitor: it is Hedin.

Hedin wants the President to isolate the Matrix and threatens him with a gun. The Doctor and Nyssa enter and Hedin reveals that the threat is Omega. The Castellan then arrives and shoots Hedin down. The Doctor asks that the Matrix be shut down, but he is too late – Omega appears on the Matrix screen.

The Doctor enters the Matrix and obtains from Tegan some clues as to the location of Omega’s TARDIS: ‘JHC’ … Holland … Amsterdam. The Doctor and Nyssa leave in the Doctor’s TARDIS, a pulse loop being used to allow them to go undetected. The Doctor builds a device to knock Omega’s fusion booster out of phase.

The Doctor arrives with Nyssa in Amsterdam and finds ‘JHC’ in the telephone directory – it is a youth hostel chain. He has no money and so cannot telephone the hostels; the only option is to check them all on foot.

Omega’s power meanwhile continues to build until he has enough to achieve a transference. His head starts to melt. The Doctor discovers from a hostel receptionist (Maya Woolfe) that Tegan is at Frankendahl, and he and Nyssa rush there. He realises that Omega is in Amsterdam because it is below sea level and this maintains the water pressure for the fusion generator. The Ergon tries to prevent the Doctor and Nyssa from entering Omega’s TARDIS but Nyssa uses its own gun to make it vanish. The Doctor explains that it was a psycho-synthesis being. The Doctor attaches his device to the fusion generator.

Omega is dissolving, but when the fusion generator explodes he is unscathed. He reveals his face, which is now identical to the Doctor’s, and then leaves the crypt. The Doctor takes the Ergon’s gun – a matter converter – as he cannot destroy Omega without it. Outside, Omega (Peter Davison) has killed a gardener and taken his clothes.

The Doctor, Tegan and Nyssa chase Omega through the streets of Amsterdam as there will be a massive explosion if they don’t stop him. Omega’s body is slowly starting to decay as he runs through the streets.

Eventually cornered, Omega taunts the Time Lord that he lacks the courage to kill him. He then wills his own destruction, but the Doctor fires the matter converter at him and he fades away.

Back on Gallifrey, Damon reports that the anti-matter has gone. Omega has been destroyed.

Synopsis from Doctor Who: The Fifth Doctor Handbook by David J. Howe, Mark Stammers and Stephen James Walker, reprinted with permission; further reproduction is not permitted.

Production Team
Lynn Richards (Assistant Floor Manager), Dee Robson (Costumes), Marjorie Pratt (Designer), Fintan Sheehan (Film Cameraman), Bernard Ashby (Film Editor), Roger Limb (Incidental Music), Frances Needham (Make-Up), John Nathan-Turner (Producer), Diana Brookes (Production Assistant), June Collins (Production Associate), Eric Saward (Script Editor), Dick Mills (Special Sounds), Don Babbage (Studio Lighting), Trevor Webster (Studio Sound), Peter Howell (Theme Arrangement), Ron Grainer (Title Music), Chris Lawson (Visual Effects)
Story Notes
Only the second time in the series' history that the show had filmed outside Britain, much of "Arc of Infinity" was filmed on location in Amsterdam. The use of Omega ("The Three Doctors") was suggested by fan consultant Ian Levine, while overseas filming was an idea from producer Nathan-Turner and a story returning to Gallifrey was the concept of script editor Saward -- all in an attempt to begin the series' 20th season, an anniversary fact not lost on the production crew. Janet Fielding, of course, returned after being written out at the end of the previous season. The character of Omega was billed as "The Renegade" so as not to spoil the surprise. The working titles of this story were "The Time of Neman" and "The Time of Omega". The character of Borusa ("The Deadly Assassin") was reintroduced, now Lord President (with a different actor, of course, and a note that he'd regenerated). Ian Collier played Omega (not Stephen Thorne, the original) while the serial boasted two important guest starring roles: Michael Gough, who had portrayed the Celestial Toymaker in the First Doctor era (and later achieved international fame in the "Batman" movies as Alfred Pennyworth, the Wayne Manor butler), portrayed Councillor Hedin, the piece's archtype villain; and popular UK actor Colin Baker portrayed Commander Maxil. Baker at the time commented to his wife that his guest appearance would probably preclude him from ever taking over the role of the Doctor - a notion that would prove wrong in two years when Baker became the Sixth Doctor. John Nathan-Turner even had a cameo appearance in the story, shooing spectators away who had recognized Davison from his role in "All Creatures Great and Small".
For more in-depth information about the contents of this story, a complete episode-by-episode detailed breakdown can be found at the Doctor Who Reference Guide.
Additional, more detailed information about the production of this story can be found at Shannon Patrick Sullivan's A Brief History of Time (Travel).
Video release
Released as "Arc of Infinity" in the UK [March 1994] and Australia/New Zealand [April 1994] (BBC catalog #5199), US/Canada [September 1995] (WHV catalog #E1296); episodic format, cover illustration by Pete Wallbank.
Audio release
Some music from this story was released on cassette and CD, "Doctor Who - Earthshock: Classic Music from the BBC Radiophonic Workshop Volume 1" in 1992 (Silva Screen FILMCD 709). The release also featured music from other stories.
In Print
Novelised as "Doctor Who - Arc of Infinity" by Terrance Dicks (Target #80), first released in 1983 with photomontage cover.
For more details on the various novelizations of this story, with additional background material, artwork and details of both UK and foreign releases, visit On Target.