“Meglos” is an adventure of the eighteenth season of “Doctor Who” classic series, which aired in 1980. It follows “The Leisure Hive” and it’s a four parts adventure written by John Flanagan and Andrew McCulloch and directed by Terence Dudley.

The civilization on the planet Tigella is in danger: the survivors live underground exploiting the energy of the Dodecahedron but it started fluctuating. The tensions between the scientists faction and the religious faction increase the problems and the leader Zastor hopes for a solution from an old acquaintance, the Fourth Doctor (Tom Baker), who’s arriving together with Romana II (Lalla Ward).

Meglos is an intelligent plant that remained hidden under the surface of the planet Zolfa-Thura, Tigella’s neighbor. Now he intends to use a group of space pirates to go to Tigella to get the Dodecahedron and use it for his purposes.