The Stigorax are a species of small, non-sapient mammalianoid carnivores native to the planet Terra Alpha. Their appearance is reminiscent of a dog-sized opossum with a menacing look, pointed ears and a row of spikes on its back.
Despite their unimpressive appearance, they are described as intelligent and ruthless predators, and were known to prey upon the native Pipe People. By the time that the planet was colonized by Humans, the colony's ruler, Helen A., kept the last known member of this species as a pet and named it Fifi.
- Doctor Who season 25 - The Happiness Patrol (1988)
- The Doctor mentions that he once had an encounter with a Stigorax in Birmingham, during the 25th century.