The Scorchies were a species that had no form of their own but took the form of puppets that arrived on planets to destroy or enslave their populations.
Biology
After their bodies were destroyed, the Scorchies were left as incorporeal beings. The Scorchies then inhabited puppets. (AUDIO: The Scorchies)
The Scorchies naturally generated a psychic induction field, which forced those around them to sing. (AUDIO: Comeback of the Scorchies, Encore of the Scorchies)
Scorchies fed on emotion to survive. Some Scorchies lived on joy from their performances, (AUDIO: Encore of the Scorchies) while others fed on negative emotions such as disappointment and fear. (AUDIO: Comeback of the Scorchies)
History
The Scorchies was a given name to the species. They originated from a planet that had only recently discovered television by Professor Baffle. A species came along and destroyed the planet through television. Professor Baffle then tried to save his people, but they ended up as formless, floating between planets. Taking their revenge on the universe, they burned out planets by hypnotising the population. They earned their name because of this. (AUDIO: The Scorchies)
At some point, two of the Scorchies called Mister and Missus developed humanoid bodies by 'borrowing' them. This enabled them to live like ordinary humans, but they soon realised they need a lot of mental energy to maintain and utilise the body. (AUDIO: Encore of the Scorchies)
In December 1894, a group of Scorchies arrived on Earth despite the television not having been invented yet. They booked appearances at Henry Gordon Jago's New Regency Theatre. They tried to hypnotise hundreds of audiences in New Regency Theatre to use them as source of mental energy for Mister and Missus. But when Jago and Litefoot figured out their plan, Ellie Higson burned the scorchies with fire. (AUDIO: The Wax Princess, Encore of the Scorchies) There were automata of scorchies in Carruthers Summerton's Museum of Curiosities, in memory of this adventure. (AUDIO: The Museum of Curiosities)
The Third Doctor and Jo Grant later encountered another group of Scorchies on Earth, eventually defeating them and sending their consciousnesses back into space. (AUDIO: The Scorchies)
In 2015, Iris Wildthyme and Edwin Turner encountered them in Margate after a Brian Bonamy concert. They offered Brian fame. Iris once signed an exclusive contract with them. (AUDIO: Comeback of the Scorchies)