Nehra, a magician for a maharaja, feels threatened when another magician shows up with his blue box. Nehra tries to find out what he can about the magician. He uses spells to examine the blue box and is shocked to see the Earth surrounded by threads. He deduces that the magician is trying to destroy the Earth with these threads. Nehra calls up an "asura", or demon. However, the demon he calls up, Vishathra, isn't very bright.
After Nehra explains to the demon what he will do, the magician, who calls himself "the Doctor", enters and tricks Vishathra into cutting his own thread. Vishathra disappears. The Doctor then explains to Nehra that the threads are part of the Web of time. Snipping even one or two threads will unravel all of causality.
- Each story in Short Trips: Repercussions includes a character or characters being taken out of their time by the Doctor to avoid harm to the Web of Time. In this story, it is Nehra.
- The Third Doctor makes an appearance at the end of the story.
- The Doctor claims Albert Einstein was a work colleague and that he was wrong about many things. He later meets Einstein again in his seventh (TV: Time and the Rani) and eleventh incarnations. (TV: A Christmas Carol, "Death Is the Only Answer")