Gareth Thomas (Shem) went on to play rebel leader Roj Blake in the BBC science fiction drama series Blake's 7 (1978). Derek Farr (Professor Evans) also appeared in the series, playing computer scientist Ensor, creator of the mobile supercomputer Orac.
A novelization of the series by Ian Evans was published by Corgi.
The series had a few similar ideas to that of Doctor Who: The Tenth Planet: Part One (1966) (TV Episode) and THX 1138 (1971). The Medusa planet drifts into the solar system and the female inhabitants of Medusa live in a high-tech underground city.
Medusa was a monster from Greek mythology. A winged human female with living venomous snakes in place of hair.