The series ran from 31 July 1986[1] to 21 December 2006, originally airing on a weekly basis on Channel 4.

The number of films per series fell over the years, from eighteen one-hour films a year originally to twelve by the late 1990s.

The last regular series was shown on 21 December 2006, with twelve films.

One-off films have occasionally been aired under the title "Equinox Special" (e.g. the 90-minute Secrets of the Super Psychics first transmitted in 1997).

This article relating to a non-fiction television series in the United Kingdom is a stub.