The beautiful Drahvins come from the planet Drahva in Galaxy Four. Drahva is a female-dominated society; they only keep as many men as they need, and the others are killed because they consume valuable food and fulfill no particular function. There is, however, a need for soldiers, so Drahvin scientists cultivated clones in test tubes. They are not considered to be living, as such, and certainly they seem to be less than fully sentient. Their only purpose is to fight and kill, and they are bred to barely think for themselves at all. Instead, they merely follow instructions from their leader. Drahvins are very feminine, with blonde hair, and they wear green and white uniforms with high heels. But they are also very strong, very driven, very cunning, and their primary emotions are hatred, anger and fear. They do not understand concepts like friendship. The Drahvins profess to be concerned for others, but this is merely a veneer hiding their guile and overriding self-interest.
Drahva is an overpopulated planet, so a Drahvin named Maaga took a ship and at least four soldiers to investigate a sector of Galaxy Four for a planet to colonize. In their search, they encountered a spacecraft manned by the hideous, disgusting, evil Rills. Maaga tells the Doctor that the Rill ship fired on them, so they fired back, and both ships crashed, at which point the Rills killed one of her soldiers. But this is, in fact, far from the truth. Maaga fired first, with the Rill ship returning fire; and when the Rills tried to help one of her injured soldiers, Maaga fired at them, and then killed the soldier herself.
There is a strong divide between Maaga and her soldiers. Maaga eats a luxurious diet of only leaves; her soldiers must eat leaves and twigs. The servants' guns hardly work at all, whereas Maaga's is much more powerful. And because the drones are simple-minded, easily swayed by other people's logic and prone to failing at the tasks set before them, Maaga frequently shouts at them and frightens them with graphic descriptions of what could happen to them if they fail.
The Drahvins arm themselves with futuristic guns, charged through a connection in the wall of their spaceship, and metal mesh with which they can incapacitate the Rills' servant robots. Their ship fires bursts of flame, although presumably this is not the only weapon it possesses, as flame would be rather ineffective in space.
The Drahvins' intention is to steal the Rill spacecraft and abandon them all on the planet before it explodes, despite the fact that the Rills have offered to take the Drahvins with them. Their hate blinds them to a possible solution, and as a result they also alienate the Doctor and his companions. In the end, the TARDIS crew and the Rills escape the planet's fate, while Maaga and her soldiers are doomed to die with it.
