The Doctor [ working on the TARDIS ]: Such a simple repair job.
Nyssa: Why didn't you do it sooner?
The Doctor: Well, you know how it is: you put things off for a day, and the next thing you know, it's a hundred years later!
DVD: Doctor Who: Time-Flight/Arc of Infinity (BBCDVD 2327) released in August 2007. Doctor Who: Arc of Infinity released in U.S.A./Canada (Warner Home Video E4190) in November 2007.
Video: Doctor Who: Time-Flight (BBCV 5199) released in March 1994. Released in U.S.A./Canada (Warner Home Video E1296) in September 1995.
Novelisation: Doctor Who - Arc of Infinity by Terrance Dicks (ISBN 0 426 19342 3) first published by W H Allen in 1983.
The working titles for this serial were Time of Neman and Time of Omega.
Janet Fielding (Tegan Jovanka) does not appear in this episode, having been left behind by the Doctor at the end of Time-Flight.
Colin Baker, who plays Commander Maxil, would of course later join the cast as the Doctor.
This story was shot on location in Amsterdam.
Michael Gough, who plays the traitor Hedin, also played the title character in The Celestial Toymaker.
The script addresses an ongoing continuity error by having Nyssa observe that the temporal grace circuits in the TARDIS were in need of repair.
For the third time in as many stories, Borusa is played by a different actor.
The sound used for the TARDIS recall circuit is identical to the recall sound used in The Hand of Fear, Episode Four.