Ravnok spent the beginning of her life on Dryra. She believed that her race needed a crisis to develop and amassed a group of followers. She released a virus that killed most of the Dryrth. The Council of Elders declared that she was a criminal and she was forced to leaven Dryra. She took with her a container of cheese. She took the cheese to the Moon and hid it in a crater.
Ravnok returned to Dryra and was put on trial with her only surviving follower: Vartex. Although they were sentenced to be imprisoned for 3000 years, Ravnok and Vartex quickly escaped by killing their guards.
On 7 July 2015, they returned to the Moon to get Ravnok's cheese, but found that humans had built Moon Village One on top of the container. They pretended to be peaceful animals and gained the trust of Freda Jackson, the astronaut in charge of the base. The Fifth Doctor, who was visiting the base with Tegan Jovanka and Vislor Turlough, did not trust them.
After being left alone in a guest room, Ravnok and Vartex came up with a plan to get their cheese by sabotaging the base's nuclear reactor. They cut into the reactor with a high-intensity laser beam, but were caught by Jeffries before they could do damage.
Later that night, Ravnok and Vartex went into the reactor again when they thought everyone else was asleep. This was not true, as the Doctor, Jeffries, and Jackson were waiting for them. Vartex killed Jeffries and Ravnok grabbed the Doctor while he was surprised. With the Doctor as their hostage, Ravnok set the base to explode in 20 minutes. Tegan, Jackson, and Turlough stormed into the room and shot Vartex. Ravnok ran out of the base and to her spaceship to escape the blast. Ravnok never made it to the spaceship because Jackson had emptied her spacesuit's oxygen tank. She died on the surface of the moon due to lack of air. (COMIC: The Lunar Strangers)