Electrons moved in two dimensions when influenced by a magnetic field, hinting at how a similar effect would occur in the fourth dimension.

In the illustration: A tesseract (a four-dimensional cube) and the "shadow" it casts on a plane—the quasicrystal discovered by Shechtman. According to Prof. Bartal, "The fact that a quasicrystal ...

This concept was repeated in the Fourth Doctor’s final story, Logopolis, in which the Master materialises his ship around (and inside!) the Doctor’s. Trapped in a prison cell together ...

Kilgarriff would later play the giant robot in the Fourth Doctor’s first adventure, Robot, and would once again play the Cyber Controller in Attack of the Cybermen, this time with his own voice.