The Sensorites

Our intrepid band of time/space travellers turn up inside a spacecraft being held captive by the Sensorites, a race of aliens with highly advanced psychic abilities. Though they appear to pose no physical threat, the Sensorites steal the TARDIS's locking mechanism and take our heros captive alongside the spacecraft's weary crew. Susan reveals an aptitude for telepathy, pretty much everyone except for Barbara gets brought down to the home planet of the Sensorites, Ian gets poisoned, the Doctor gets attacked in an aqueduct, a murderous plot is revealed, and a member of the Sensorites high elders is killed. Sounds interesting and yet The Sensorites is generally regarded as overall boring serial. This is probably because of the basic design of the Sensorites themselves. Despite their aforementioned psychic abilities, the Sensorites are easily harmed by loud noises and are effectively blind in low light. The TARDIS's crew are pretty much immune to the Sensorites psychic powers for some reason so their captivity doesn't really come with life or death stakes. The Sensorites prove to be the most benign of the alien threats so far encountered by the Doctor and his companions. Also, the Sensorites look like Admiral Ackbar with a chinstrap toupee.

Rating: It all started out as a mild curiosity in a junk yard%

(Image from theruedmorgue.blogspot.ca)