Doctor Who - Season 23 - Eps 12: Terror of the Vervoids (4)
With factions vying for control of the ship, the Vervoids are found to be responsible for the many disappearances. Only the Doctor sees the fundamental but missed point as to why they can't be reasoned with or why they can't be allowed to arrive on Earth.
About Doctor Who

Title: Doctor Who
First Air Date: 1963-11-23
Last Air Date: 1989-12-06
Status: Ended
Rating: 7.869/10 (from 666 votes)
Language: EN
Seasons: 27
Total Episodes: 694
Network: BBC One BBC Television
Genres: Drama, Action & Adventure, Sci-Fi & Fantasy
Production Companies: BBC
Synopsis
The adventures of The Doctor, a time-traveling humanoid alien known as a Time Lord. He explores the universe in his TARDIS, a sentient time-traveling spaceship. Its exterior appears as a blue British police box, which was a common sight in Britain in 1963 when the series first aired. Along with a succession of companions, The Doctor faces a variety of foes while working to save civilizations, help ordinary people, and right many wrongs.
Cast

Sylvester McCoy
The Doctor

Sophie Aldred
Ace